Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af5fc5c1c1b604d…

MALICIOUS

PDF

78.6 KB Created: 2021-01-26 18:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8eff9c5a092693e3945417ef1c76b61f SHA-1: e2fdd4b57b0db97983b1eb47c29be3f3f8551de9 SHA-256: 4af5fc5c1c1b604d8cfb6014e02f8fee96ff2026ce9f8e878dbdf5c1583ded05
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 other PDFs, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier also indicate maliciousness, likely phishing or trojan activity. The document body, though heavily obfuscated, contains a search term that aligns with the external URLs, indicating a lure to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/aws?utm_term=audio+software+for+windows+10+free PDF link annotation
    • https://cdn.sqhk.co/mekaxosur/Lwjfigk/man_talking_to_animals_movie.pdfIn PDF document text
    • https://sazezikamujut.weebly.com/uploads/1/3/1/4/131438312/24602.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/bieSehc/39870528882.pdfIn PDF document text
    • https://tetusujofejami.weebly.com/uploads/1/3/2/6/132695476/358754.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/d1KNhgR/mechcom_2_3d_rts_apk.pdfIn PDF document text
    • https://kukitame.weebly.com/uploads/1/3/1/3/131379641/e5ff8a.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/69e67077e6fa.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/jhjbMje/past_future_mp3_song_download_pagalworld.pdfIn PDF document text
    • https://nozinogut.weebly.com/uploads/1/3/1/1/131164424/b87fb372.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/godoremitiwuja/favumagesilibuvixudibas.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/wawitawox.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/treatment_of_bronchial_asthma.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_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 5144 bytes
SHA-256: 187da4489c1b52811e122a03b22165f8990e4ef75240748dc7d0e876d007b911
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 10636 bytes
SHA-256: 40849e20a57886cd96be6416650344ed086a92db317e210e8117b2c635d6f067

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