Malicious PDF — malware analysis report

Static analysis result for SHA-256 498974215357a0f7…

MALICIOUS

PDF

101.6 KB Created: 2021-02-18 09:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 38962045f632e99cc10270e617a744b7 SHA-1: e672dd1267df0e57ef88d2f3e84e0775fc4cc093 SHA-256: 498974215357a0f7cce27023a4a642d5fc53d9668b7c2a0348a087e9dfe6a7f9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least two identified as pointing to known malicious redirector infrastructure or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=do+boosters+expire In PDF document text
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/wojekudo.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/5208603.pdfIn PDF document text
    • https://xiwabedosebu.weebly.com/uploads/1/3/1/3/131398066/707574.pdfIn PDF document text
    • http://kreativoblako.com/24211552234v0dco.pdfIn PDF document text
    • http://roflan.site/84456776599detba.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/809f48ed22f48.pdfIn PDF document text
    • https://piwupibuzidiki.weebly.com/uploads/1/3/0/7/130739867/7904133.pdfIn PDF document text
    • https://xiresipi.weebly.com/uploads/1/3/1/1/131164504/675e75c.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/a76c236b3479a70.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/jio_phone_play_store_gamesrx0o3.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/bpgeji4/cat_war2_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_5fd7a885ad094.pdfIn PDF document text
    • https://jalupibu.weebly.com/uploads/1/3/4/5/134520797/tasavuxigitarukalo.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/3xnPQE0/75933889122.pdfIn PDF document text
    • https://pulolated.weebly.com/uploads/1/3/0/7/130740140/d87830.pdfIn PDF document text
    • http://nakomajuvedina.iblogger.org/english_vocabulary_list_with_tamil_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://sifebina.epizy.com/4678291184.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 5684 bytes
SHA-256: caeed39893b82969c26dfcac95946a3fad4fbae0765b3ea81aa15456cfe783a6
font_01_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 4776 bytes
SHA-256: 4e8e66826ce8de6be95eb40075bb5814bc1766b61f66e67872b54c5afa451e7b
font_02_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 2656 bytes
SHA-256: 1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178
font_03_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 2328 bytes
SHA-256: 6d897259d7ab9db79b0dbb16904cd99ff486aa7f4a475590a5d3e44eab6e0eed
font_04_sfnt_off000119d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 2108 bytes
SHA-256: b3976ad28991401f3a7e0d936621f3963ed8fd81aff5bedc9e25cf6548b1959b
font_05_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 6640 bytes
SHA-256: c8cb303e765c67f43d6d34f29c1d02953890772ff7b697be779fb29335000f72
font_06_sfnt_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 14464 bytes
SHA-256: 47275dd3e884dac5d504090a7e4a489ba98136b8a2b0a40e7c5d991164f3aaa8
font_07_sfnt_off0001612b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1612B 16848 bytes
SHA-256: 5f668481c4b71ed6bb6fd95a99604eae3612a00d49d5297aa7cbc522e8ca9edf
font_08_sfnt_off00017940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17940 3276 bytes
SHA-256: 333cf0bae5291019b79d77a37696b89786718dc77a0e6f1c7356514a48765311

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