Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7830bf77e652798…

MALICIOUS

PDF

75.0 KB Created: 2021-01-17 00:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c24a688bc0e558c084b8a95300c43d78 SHA-1: 184ca38a0569062057c505b5ab4ebbf4f5baafb8 SHA-256: e7830bf77e6527984244408aefb658364a18c88dc84f9b319749be049b59d8fb
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=extraccion+de+petroleo+en+colombia PDF link annotation
    • https://site-1168222.mozfiles.com/files/1168222/71368860212.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/kifajosowifipekuga.pdfIn PDF document text
    • https://site-1178142.mozfiles.com/files/1178142/android_studio_3__4_disable_instant_run.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/amhggX5/mybcit_learning_hub.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/jjjiljT/anti-_theft_alarm_for_mobile_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/jvqhbie/91856809887.pdfIn PDF document text
    • https://site-1174959.mozfiles.com/files/1174959/welevavaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5ff249e6b5191.pdfIn PDF document text
    • https://site-1180648.mozfiles.com/files/1180648/idle_boxing_idle_clicker_tycoon_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_5f952e63bbada.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/hfjd7m9/ladakuwomuzo.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://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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 4992 bytes
SHA-256: 5b64abf781d94f134c5f5e434ce765edcf31fa657a096973e488a1fec3330f4e
font_01_sfnt_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 11032 bytes
SHA-256: 1eb5c2aa14214b31ee49d26ed47be113bb8ddb276a3874b5fbe71b4ac19eb514
font_02_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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