Malicious PDF — malware analysis report

Static analysis result for SHA-256 954521fd3b8e2f88…

MALICIOUS

PDF

72.1 KB Created: 2021-02-18 13:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4c7f8a9e88468e73389656f8963d6fe SHA-1: d1633b4c9997a58b44c559fe5a3f10b9c2ad4d20 SHA-256: 954521fd3b8e2f8859cd593bf9fc0f9942ce040ec95b7c9b6f528d8f8b8109c3
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 pointing to PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://baarspo.ru/strik?utm_term=which+is+the+best+alarm+system', is directly embedded and likely serves as the primary lure. ClamAV and ML classifiers also flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan.

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://baarspo.ru/strik?utm_term=which+is+the+best+alarm+system PDF link annotation
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/rubibonopepez.pdfIn PDF document text
    • https://setixifofu.weebly.com/uploads/1/3/1/6/131606861/vetigenoxujeme.pdfIn PDF document text
    • http://pemowovamig.iblogger.org/32137535202.pdfIn PDF document text
    • https://wejigewaja.weebly.com/uploads/1/3/5/4/135400860/648e4ac5e902f.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/tuxis.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/iVHvGgg/adventure_capitalist_suits_guide_2019.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/widetunipet/janasajapepe.pdfIn PDF document text
    • http://momugegunimex.rf.gd/tirutagujuvugoxirofoju.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/pirate_of_the_caribbean_soundtrack_free.pdfIn PDF document text
    • http://xufazep.epizy.com/zepisijozu.pdfIn PDF document text
    • http://lobakixadob.epizy.com/vejuvidelexafagelewop.pdfIn PDF document text
    • http://xevotoxukapo.epizy.com/kubaxifupizululixogesod.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/pawejotiz.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/metformin_use_without_pcos.pdfIn PDF document text
    • http://sisubupofi.epizy.com/90918631109.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/rose_good_morning_photo.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_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 5292 bytes
SHA-256: 21a371eb6decc717f52bc3b7b5a0ed81b848697fad3d4268c037ab11a6ffad68
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 9988 bytes
SHA-256: da522904599db00456a3511e03c18921fce758ab398fc8bb1a51c7905486b337

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