Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc61664f57c8ca26…

MALICIOUS

PDF

77.3 KB Created: 2021-02-26 00:35:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e359fa7f9548780374a3d128f78db7e2 SHA-1: 0eeb59be4655d704c235e4199c4c9882e4283557 SHA-256: fc61664f57c8ca265a2775ef4903e20126c061c392971b3ae3817cacf8d1596b
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://druttle.ru/award?keyword=bissell+crosswave+pet+pro+2328+parts PDF link annotation
    • https://cdn.sqhk.co/sobupepokor/geQiiij/50482061966.pdfIn PDF document text
    • https://jikesisepam.weebly.com/uploads/1/3/1/4/131406861/wowugamepo-pejitugas.pdfIn PDF document text
    • https://lamalirigade.weebly.com/uploads/1/3/4/5/134595912/ec90a9d4790f8fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416786/normal_5fcae52cf2aa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fc8fd6f1c161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_6035140adc2c1.pdfIn PDF document text
    • http://megaliwuxo.22web.org/junji_ito_manga_free_download.pdfIn PDF document text
    • http://trend-sales.fun/mystical_manga_tarot_guidebook0713i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_603824fac543b.pdfIn PDF document text
    • http://weareanonymous.org/38456688616w2m45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420235/normal_60180db4002f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd64551e3dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_5fe99f236032c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_601b8fcf35668.pdfIn PDF document text
    • http://padapup.iblogger.org/ap_us_history_test_2021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wisunomimat.epizy.com/60007116248.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_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 5616 bytes
SHA-256: e4c56406f4542ea230a0a40f2b3ef09f3ed3af85107d84cb78968875577286f1
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 14780 bytes
SHA-256: be4bba9e00cf51d8d8fde3b7f6cfa748ed40644c18f89870d1b4534802b92373

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