Malicious PDF — malware analysis report

Static analysis result for SHA-256 11af8449220b8715…

MALICIOUS

PDF

66.8 KB Created: 2021-01-31 20:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a8834f2b37fc82475635bfb62c10a3e2 SHA-1: e5ba365cf8dcfd0776a239198bc1310c75972444 SHA-256: 11af8449220b8715ec2b51cdb3e012cded61d3fbaf45ca4bbf83e4b303e216b5
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggests a link farm or distribution mechanism. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these external links. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=leer+y+escribir+en+un+mundo+cambiante PDF link annotation
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/notud.pdfIn PDF document text
    • https://cdn.sqhk.co/vopokemib/fhflgfH/beat_force_blade_saber_music_games.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/big8WO6/phoenix_zoo_discounts_2019.pdfIn PDF document text
    • http://adminhalil.com/crystal_report_server_20085i9yi.pdfIn PDF document text
    • https://cdn.sqhk.co/fiziroluj/eoVcvie/tavofagagebulemapejoxul.pdfIn PDF document text
    • https://xevefoworux.weebly.com/uploads/1/3/1/3/131380592/najarimegosa.pdfIn PDF document text
    • http://winoraama.space/vupib46daw.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/heBggJ4/zombie_wallpaper_live.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/TQ6V6bx/88251905068.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/haP0xid/classroom_rules_for_virtual_learning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/explanatory_writing_template.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/game_guardian_free_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/aao_raja_dj_song.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 5236 bytes
SHA-256: c1be9ed50828693f752c2839aeb26bfe0df2669b9c4a7b0ee94eb6ac683947c3
font_01_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 11936 bytes
SHA-256: 4ffa7e83de872c40731e17bbdcc8cc369c773d2deaf054bbda09da551f4758b7

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