Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4192e37794c67a…

MALICIOUS

PDF

77.0 KB Created: 2021-02-16 13:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0b9cb54a48394cf459ca81e0cfb65b98 SHA-1: 2cfab76b94aee9e3affa2fdff1b132897e92fc81 SHA-256: 3f4192e37794c67a9273efb12401123426ee134ea99d2f5f76ac456ccd58d1bf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are generated and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary heuristic pointing to a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to redirect users to potentially malicious or deceptive content.

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/strik?utm_term=how+to+unlock+lg+inverter+direct+drive+washing+machine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476288/normal_5ff1569192f75.pdfIn PDF document text
    • http://sudakomazagupa.22web.org/awadhesh_premi_gana_bhojpuri_video_hd.pdfIn PDF document text
    • http://meblik.su/tamagotchi_p1_life_cycle1eelr.pdfIn PDF document text
    • http://mrshadow.net/40209216391j217p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5fec32972f435.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_60045abeeb31a.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/fe2e5.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/geluzisuna.pdfIn PDF document text
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/ratabofijobupukorem.pdfIn PDF document text
    • http://yildirimotobursa.com/wanawisopolexowapivawio8aur.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/8850483.pdfIn PDF document text
    • http://kexazejarufag.iblogger.org/glioblastoma_multiforme_mri_findings.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390068/normal_5fca80a6560c3.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/nezanurugega/vatuxijetulibologex.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/sorimexelajojowudejix.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/xedewalipewubu.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/32975011608.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/zukam.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_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 5532 bytes
SHA-256: 5cc67847281ba4ffa3cbdc9fe063b3034b433c854a67d1a6ddbf66a54eedc6b2
font_01_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 10848 bytes
SHA-256: 5b4a76969c5e5ee9eb28d26d3045aa0092dda975f7edca331d012f846d79d248

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