Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d523ecf13f02f46…

MALICIOUS

PDF

71.1 KB Created: 2021-02-18 14:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 235dfa0580dd0c2ee3efa7235ebe7efd SHA-1: 17e32d0f39689936cdc63dc1c50ff04f209fbdba SHA-256: 4d523ecf13f02f4610d110df8992a4390bda10b8b16ce860826e86a2640bee2d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with one heuristic specifically noting a 'mass external PDF link farm'. While no scripts were directly extracted, the PDF structure and the presence of many external URLs suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

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://baarspo.ru/123?utm_term=how+much+does+a+league+of+legends+player+make PDF link annotation
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/fekaka.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/hibZb3d/50024660262.pdfIn PDF document text
    • https://cdn.sqhk.co/xubenijevewe/UG7Ycji/xinobata.pdfIn PDF document text
    • https://katodelof.weebly.com/uploads/1/3/6/0/136051175/telanizamasemijufebi.pdfIn PDF document text
    • http://gaydating.world/zipatitoweribusedui73xd.pdfIn PDF document text
    • http://vykupavto54.ru/double_clutching_defined0ch8l.pdfIn PDF document text
    • http://health2health.online/bulkhead_transformers_animated_toy6hwha.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/pECgeZi/chennai_super_kings_jersey_amazon.pdfIn PDF document text
    • http://bighome.space/rusixuxokufurabagewa1a6ek.pdfIn PDF document text
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/vosigugolebode-zefigilanevoviw-fufope-lagezarabi.pdfIn PDF document text
    • http://hangzhoumetal.ru/xuxavupuxusajopepabadesg2w0u.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/853e923148.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/sesafefanulokam/cag_full_form_in_audit.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/xoboruzebawowaka.pdfIn PDF document text
    • http://suwekijixi.rf.gd/logilofamulozeboxu.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/genabejobemisureguku.pdfIn PDF document text
    • http://vudatuvabejosix.epizy.com/azoospermia_adalah.pdfIn PDF document text
    • http://xewenofos.epizy.com/38417951367.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/vezotifesiwod.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/accord_cd_ripper.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/6536201081.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_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 5788 bytes
SHA-256: 455adba2871a06556fabf5d8cb8391d93aeffa657ddd989b2238f8b10df68e0f
font_01_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 10388 bytes
SHA-256: c03c99291f11da3db53448c5d1215404abc7e5f65b81cb5f7549b93571e698c2

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