Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39d341851f532c4…

MALICIOUS

PDF

73.4 KB Created: 2021-01-20 22:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 494495c58dd61130330df8b68973a8bc SHA-1: 78d9949362c585f0a989b5d24be41dbc1e9504c5 SHA-256: a39d341851f532c450f942128850a5c12688d2e5ea6b80e3be1d3ab177a116e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URLs points towards a malicious document designed to redirect users to potentially harmful sites.

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://maypoin.ru/123?utm_term=members+only+leather+jacket+ebay PDF link annotation
    • https://cdn.sqhk.co/xufaribo/hhjeRI3/lasuxoxakatu.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/jhhaAjc/vojasofugireradefemidiki.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/8863982.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/d8119f7a3eb96e.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/vroB2ie/niziduwezixilepad.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/hhhaD3d/teperejuwivif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405945/normal_5fefdcc3eccac.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/Shf2Ltr/knock_down_the_house_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426957/normal_5fca964608ec8.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/0Giiifm/17249110196.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/pjejeyC/colour_harmony_for_artists.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/jjmibhb/indoor_rowing_competition_2019_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5fccd4f348261.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/tetofamuxulil/83917870359.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/bartender_celebmix_answers.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_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 5424 bytes
SHA-256: 6876720ccba764864d6e84a0001c6b8478d68221893b1a03e79057bdb8b0f30a
font_01_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10836 bytes
SHA-256: 91495892f11bad7409df2f180d7e2ac26a4776786c5f03817e75abec61bd52de

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