Malicious PDF — malware analysis report

Static analysis result for SHA-256 9485d8a8e37359c5…

MALICIOUS

PDF

86.3 KB Created: 2021-05-07 17:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 16c1fb4b670ed67c92537ab06c505a23 SHA-1: 65ec529f204efcfa8d31944d01abca77f4be2cf2 SHA-256: 9485d8a8e37359c517b218b7d751ab56d48ecbedb454d8cf42a70537ee9148f4
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://zajinet.ru/strik?utm_term=how+to+practice+muay+thai+at+home PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374211/normal_606a9b699c8a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366063/normal_5ffbff21617b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485826/normal_60674becbddf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5fdd27b384064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_606d157da6ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_5fe9eab22213b.pdfIn PDF document text
    • http://xuzokunomiba.iblogger.org/ximebokuxusekased.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_6021ae3b3be63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_601bd45ef03fe.pdfIn PDF document text
    • http://refoxipixob.iblogger.org/gerbera_paper_flower_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_602b2a6a3f88d.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://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_3adc0fc027e0430aaa139ed4789b8d04.pdf?index=trueIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_3fbb5bf637b04f8bb5e55a1dee49bae8.pdf?index=trueIn PDF document text
    • http://miripiwamaza.epizy.com/9919925303.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_a98d6003c4ff49e39fe0ad2a0aa1d71a.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_67b24ef03cb04a84ac84672ac2417fc8.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_342c210b2f0344d7820c4b2bf92980a8.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_7b6c37dd307447eab2165b116b6ff6e7.pdf?index=trueIn PDF document text
    • http://mukexojot.rf.gd/antagonistas_h2.pdfIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_d4e5b8f0b2b449578df143a3904ca9c1.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_2785be020152404c9bbc5550d689a32c.pdf?index=trueIn PDF document text
    • http://bibezulanivukis.rf.gd/mergers_and_acquisitions_journal.pdfIn PDF document text
    • http://mumudok.epizy.com/fogesafu.pdfIn PDF document text
    • http://wajidatopoz.epizy.com/psicologia_escolar_prticas_crticas.pdfIn PDF document text
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_f8ba4e6951ed45e6942f38014c605577.pdf?index=trueIn PDF document text
    • http://jaromazezudeg.epizy.com/present_perfect_tense_exercises_for_beginners.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 4896 bytes
SHA-256: 43e95ead37572b4b415e9a17a31717ea46bec8a732181dd0497abeb970ccd6f8
font_01_sfnt_off00011692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11692 11464 bytes
SHA-256: 86ef9f2004c08af176cfe78bd9c4ba5c5eed282a022d6755bc26eb95ae1de94e
font_02_sfnt_off00013cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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