Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9d97f67bfc5e76…

MALICIOUS

PDF

75.3 KB Created: 2021-05-09 19:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c9cfeb918f20d28c94f3a79348144d0d SHA-1: b060b35f28f7a1628814d3cb3bfbcb6d18dd9133 SHA-256: 6a9d97f67bfc5e76e57f74a5773413f1149317abbb64e821da1d07dcf54d8594
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed for phishing or scamming. The heuristic firings confirm the presence of malicious redirector links and a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/strik?utm_term=wind+turbine+power+pros+and+cons In PDF document text
    • https://cdn.sqhk.co/lusesito/ggifhhU/pejinapovebane.pdfIn PDF document text
    • http://usacreditmonitoring.info/bivisaperurosijeveve315vb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_6039a0b46e2a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_602b09687615c.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/cgjSdgh/31038266296.pdfIn PDF document text
    • https://cdn.sqhk.co/lakinidiku/deAVicZ/19792115594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450160/normal_5ffc510a5cc79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420911/normal_6062361da3344.pdfIn PDF document text
    • http://fitdieta.com/zuseveximevazofageseto4o7lo.pdfIn PDF document text
    • https://cdn.sqhk.co/dilijenaka/hbmigkx/biggest_loser_diet_plan_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_1fec0deb3f0443f3b4ad7fd288b4438a.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_ca7d928050e2418da838c0ce0592e78e.pdf?index=trueIn PDF document text
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_3249953a8c9f4f4888489c821aedc26f.pdf?index=trueIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_5938068071b9497fa7f3d59f105c0e31.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_ea4e377df5dc4ce180972ec4df81f674.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_5e4d0a90539e40b488139f78cba6d4b6.pdf?index=trueIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_575b8f29cc8149d1b94b605e23789ec1.pdf?index=trueIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_0a1026849f374c9c984a7a4ef57e3acf.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_8b352f9909c344be9640f412b2fd9609.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_38b8903c8d344eaabc09f548e436af27.pdf?index=trueIn 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_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 5280 bytes
SHA-256: 54354dc3823fce6bc39b213fb9451751ed661327747e43b358968e1351307a44
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 10724 bytes
SHA-256: d294b6712dc9909fd9361803673b4fde72151391b7e5bee99c6bb82800056b96

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