Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54a920cadbdb09c…

MALICIOUS

PDF

122.5 KB Created: 2021-06-08 07:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8e988bd74b7b722fbf669d9f0b1ad434 SHA-1: 415d511f9b3255b721728ebacd0367eb2e61fab6 SHA-256: d54a920cadbdb09ca3cacfaf650857785e5880d6a0f9dd445d7cf3a259fff74f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://infrive.ru/pbw?utm_term=chopped+junior+episode+guide PDF link annotation
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/30fc85a5d8cd.pdfIn PDF document text
    • https://dovoviwum.weebly.com/uploads/1/3/0/7/130776035/4369716.pdfIn PDF document text
    • https://xuxedujuwa.weebly.com/uploads/1/3/5/3/135345360/xozema.pdfIn PDF document text
    • https://bibonuben.weebly.com/uploads/1/3/4/5/134576194/87111fc839bd06c.pdfIn PDF document text
    • https://wirolubu.weebly.com/uploads/1/3/1/4/131453990/7156387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fokojifidesi.pbworks.com/f/90413118317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6042e3e4-6f34-4a50-b697-df738101971a/82085157995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02353ae6-7de7-4e67-b729-a80c64458fe8/xesowozasetoxowojazu.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144465429/how_to_construct_a_frequency_distribution_table_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305cd6e1-457d-4c02-a240-9d6eeab45742/ark_best_breeding_settings_single_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28493e2d-1a50-4dd8-ad63-630d2fd1b83e/gajizurumet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1f4113-4a4d-459e-a3c8-394ed1523bd4/fiveriwita.pdfIn PDF document text
    • http://xawaren.pbworks.com/f/doguki.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/livixajeboba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4118b2-fb61-44f2-a43a-2b07b53902cb/92265101713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91b317f-2af5-4adc-af56-9938281ee6c8/wusajezize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d79315-4e6c-477f-9482-ec01fff50591/16388890697.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144783114/zedefomasanawutamezofuw.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/kirkland_signature_master_carve_half_ham_cooking_instructions.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144608883/why_isnt_my_pellet_stove_turning_on.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/mivugejipapudodoxuvo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000196a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196A7 4880 bytes
SHA-256: d276051e36d57b2bfbde50ad2f80d048e68defb341475a55babeb10cf3f599e3
font_01_sfnt_off0001a72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A72E 11840 bytes
SHA-256: 5eb1af9514d03047a6f27149750c5a734597f5778135b47431675ab0c07903d4
font_02_sfnt_off0001cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDFA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176