Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd344830f486466…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 04:21:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a7f8c974fc760578ab18676d4bb112d SHA-1: b07a77fe81b22d6612059b22b845cb5445ba96fa SHA-256: fbd344830f4864665ad06ba6e09ffa6732327a38ff17ea29a714baa23b340cc6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=selenium+tutorial+java
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/8590659.pdf
    • http://ravapusevuj.iblogger.org/54330056130.pdf
    • https://sanorasawuvut.weebly.com/uploads/1/3/0/7/130738762/cfae137f6274aa.pdf
    • https://cdn.sqhk.co/penunotati/chgjrgd/50961826472.pdf
    • https://cdn.sqhk.co/neratimo/Hjhkgjf/assassin_s_creed_rebellion_adventure_rpg_mod_apk.pdf
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/sixitodugujorag.pdf
    • https://cdn.sqhk.co/xivomojuf/iiaLWhe/top_congo_minembwe.pdf
    • https://cdn.sqhk.co/rapowipijes/yRlbzgi/wings_financial_mortgage_rates.pdf
    • https://cdn.sqhk.co/loziromegon/89gj6rD/rozifabuwuwisejukemilubil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2397cbba-cbcf-4d66-8c6f-8266643674b9/26444961479.pdf
    • http://gazepofibugas.epizy.com/fevalasaz.pdf
    • https://uploads.strikinglycdn.com/files/baaf665f-4586-49cb-b0ce-0fd9517efcc6/xusiwekegikuzupaxo.pdf
    • https://s3.amazonaws.com/zoromexemuzid/60215846730.pdf
    • https://uploads.strikinglycdn.com/files/05b146ad-6b24-404f-aca1-37abc359c246/danielle_steel_next_book_release_2020.pdf
    • https://s3.amazonaws.com/xeropizuwe/cross-_platform_meaning_in_telugu.pdf
    • https://uploads.strikinglycdn.com/files/a225c610-5bed-42b7-be69-7ecf7c4fe881/breckwell_p22_pellet_stove_insert.pdf
    • https://uploads.strikinglycdn.com/files/d71a1d08-11fe-46de-9512-d1f05ef936a9/88838115530.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef85.bin
6177af2990d55639d1c67489f194233cf2c237fb2e63c8671d7a518a2a0a20e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 4892 bytes
font_01_sfnt_off00010018.bin
f68faf94c33837613a567e3558d6feaa33fa278d287aef87af0b04590889ccad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 11656 bytes

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