Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4aa79cbd8a5dc28…

MALICIOUS

PDF

77.8 KB Created: 2021-03-02 00:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7984d644de21e9d551cf43cb8510264a SHA-1: 761272cfdb633f884b6af9878e65d46ef67fde72 SHA-256: c4aa79cbd8a5dc28ccd76393289f3ccd040560bf2600f70687d83b47af732028
244 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing or redirector. It contains a large number of embedded links, many pointing to disposable domains and potentially malicious redirectors, suggesting an attempt to lure users to external sites. The presence of a link to a known malicious redirector infrastructure further supports this assessment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=samsung+soundbar+hw-f355+remote+code In PDF document text
    • http://fabulouss.space/54324422827ik9y.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/xugolaferoki.pdfIn PDF document text
    • https://cdn.sqhk.co/sategexarom/hibzxia/34413020998.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/xezibetujofowa.pdfIn PDF document text
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/tidekaforep.pdfIn PDF document text
    • https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/3952630.pdfIn PDF document text
    • http://tegor.xyz/kutodexaragegejafuu4j.pdfIn PDF document text
    • https://cdn.sqhk.co/dezuvosowato/dbib95Q/83484454889.pdfIn PDF document text
    • http://beremoter.online/617473115493q0ox.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/jegoma_dubuvar_zavixit.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/191b706927.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/lowuwofuxali/c_ronaldo_images.pdfIn PDF document text
    • http://rimojiruseb.rf.gd/accurip_black_pearl_software.pdfIn PDF document text
    • http://rubofad.rf.gd/16572365114.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/sheets_on_sale_at_jcpenney.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_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 6060 bytes
SHA-256: 3e79e8559f2e72306a87f02461562b960ac3553f32af892aaf2b8e0dd82254c5
font_01_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 10440 bytes
SHA-256: 8b0a99961ccaf5af2950aa79566fc5e00d9e977ac58ec2a340d38d31399c68b4

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