Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bb6ce38eed24a3…

MALICIOUS

PDF

77.7 KB Created: 2021-03-23 06:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c20770f60518293a062e78414435a58b SHA-1: 701c2a123ae718d402cbc775ee4054645f4fe821 SHA-256: 26bb6ce38eed24a3c2f74df140d8f82d970b50e133de4f381c1a059d29c7758b
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or content-luring scheme. The PDF structure and heuristic firings, such as 'PDF_SEO_DISPOSABLE_LINK_FARM', indicate a deliberate attempt to create a link farm, likely to distribute malicious content or phish for credentials.

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://vilenefex.ru/award?keyword=ielts+academic+reading+passages+with+answers+pdf
    • http://kogutipabu.22web.org/what_is_biological_determinism_of_gender.pdf
    • https://tebugusenaj.weebly.com/uploads/1/3/4/8/134870623/kutixejore.pdf
    • http://lotsmen.com/mariners_apartment_complex_piano_sheet3c28e.pdf
    • https://cdn.sqhk.co/jagakutojut/ihghhhh/47062502743.pdf
    • https://cdn-cms.f-static.net/uploads/4466166/normal_5feaec27d8c2b.pdf
    • http://totesol.iblogger.org/kixixununulizum.pdf
    • http://copyrightnotice-ig.com/4410972520807dyy.pdf
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fcbd75a53b1a.pdf
    • http://prosale.company/45016134555azmf8.pdf
    • http://zipekapivan.22web.org/forklift_training_test_free.pdf
    • https://sovevalejuwup.weebly.com/uploads/1/3/1/8/131858043/kedetulak.pdf
    • https://cdn.sqhk.co/gomiwopizi/iZidWhe/4601125243.pdf
    • https://cdn.sqhk.co/wavafinudow/jcpjjjj/1358006497.pdf
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/nipabipevag_butijobigoge_pamojufumufej_xubigidekub.pdf
    • https://runigofotizete.weebly.com/uploads/1/3/4/4/134433234/9396258.pdf
    • https://cdn.sqhk.co/notizejamebo/VJZjhl9/dofopidebanurodexemimuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kemeterotef.rf.gd/civ_6_deity_guide.pdf
    • https://uploads.strikinglycdn.com/files/ef39eae5-ba1a-464e-a7b0-cedf22255daf/bajatitewabom.pdf
    • http://joxamemi.epizy.com/rawanadelakasul.pdf
    • https://uploads.strikinglycdn.com/files/fb50828d-8413-4467-a9d9-027d29735e76/is_silica_gel_soluble_in_water_and_methanol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e6.bin
ae0e7a2098b3f677d9287efed23f9f7b7d4028d0947f129918db740bf11a44c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 5600 bytes
font_01_sfnt_off000103d7.bin
92c7a02ae5c09e562712ae54301a5016f02325bbf9ec7e8a00c8fa1d842ad7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 11788 bytes

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