Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf8cea1ebe562de…

MALICIOUS

PDF

80.4 KB Created: 2021-05-08 12:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5c2e854fc30f1272d86d1007b893534a SHA-1: 16d151c8a50e16ac489c17711175d2644fa38fe5 SHA-256: cdf8cea1ebe562de70b9831a7bf2852a6db08b142eaa5f2ac0ceefbea4c8c23d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://golowaki.ru/strik?utm_term=what+are+the+image+manipulation+techniques+used PDF link annotation
    • http://hookup673.site/how_many_pegs_to_use_on_a_sock_loompv849.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/66895552876k7dz9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_6007287f0a16f.pdfIn PDF document text
    • http://originalhallyu.com/94830230827vz63a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_605fa72e64340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_60584d611db9f.pdfIn PDF document text
    • http://tcerkovniekupola.space/hanyu_pn_yn_to_chinese_characters_google_translatetody2.pdfIn PDF document text
    • https://zoponexe.weebly.com/uploads/1/3/1/6/131606878/2da2836.pdfIn PDF document text
    • http://groshyk.site/how_do_you_combine_like_terms99mcb.pdfIn PDF document text
    • https://dawunatebebi.weebly.com/uploads/1/3/1/4/131408224/2168cc11b83d13c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_600a87f7b2c0a.pdfIn PDF document text
    • https://ganupedudajoz.weebly.com/uploads/1/3/4/5/134586443/julixajut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5feb4f67ef9fb.pdfIn PDF document text
    • https://sudegefaxir.weebly.com/uploads/1/3/5/3/135323135/nixesejaxunax-mifegatuwo-kagiten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501995/normal_602f0ec6c0e45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_6041c2dbaa4ed.pdfIn PDF document text
    • http://bonboxstudio.com/rejirox6qzq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_8fcde6ed7dcf41a58a0d7dab621118cb.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_8c52a3edf3a84b3ca16963655b2aea29.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_671e1e924bf24b47bc0b4019411a8af2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 5508 bytes
SHA-256: 8ce2514bc92d7290dddf914b8f76fc7f78e765c564db2e400972db6a31bb9bf3
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 11316 bytes
SHA-256: d1c18a3212279a5d591cb8da9a23a0dba7b618cc5cd1c42ea528067deebdd0d5
font_02_sfnt_off000125c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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