Malicious PDF — malware analysis report

Static analysis result for SHA-256 33489c01b07a7125…

MALICIOUS

PDF

67.9 KB Created: 2021-03-03 19:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 11512d7d6da5d878316416fe3942cc8d SHA-1: 4e28111797e86b558d1c015e8b4a47c3a7978047 SHA-256: 33489c01b07a7125c2bd65a0a9738a2dc0049f1140089f5b5a73d297a41cce3f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/wix?keyword=sterilite+shoe+box+container PDF link annotation
    • https://cdn.sqhk.co/pebekaja/iahgQ0b/fine_art_drawing_sketch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_6017c53559d72.pdfIn PDF document text
    • https://gigojajalul.weebly.com/uploads/1/3/4/3/134320096/tipilemiribogoj.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/definobizafi.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/gijnp88/mogejojog.pdfIn PDF document text
    • https://cdn.sqhk.co/kopuzeginev/HXF1hhZ/cowboy_boots_price.pdfIn PDF document text
    • https://lowobuganigazo.weebly.com/uploads/1/3/1/1/131163610/tasoruku.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/pirinajoguxowiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_601bcd779b7a0.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/O4iiih2/wujepozemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_5ff25eb3dd062.pdfIn PDF document text
    • https://bezaxopev.weebly.com/uploads/1/3/0/7/130740011/5441263.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/zigixeru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366956/normal_5fe1a8379595b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenares.myartsonline.com/82532961854.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_off0000cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 5200 bytes
SHA-256: c32b116a094c16fa260a5f22b0c748ad97e26595c2d564cbb8e50edaa643b06d
font_01_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 10328 bytes
SHA-256: e1f7431ea1777b40357c55c5aa69ce6109054dc95a8f4af6e1b128f5bf532cbd

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