Malicious PDF — malware analysis report

Static analysis result for SHA-256 92489255c64be09b…

MALICIOUS

PDF

129.0 KB Created: 2021-04-02 11:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f45cd9ce37f83d3ca46e104801622d17 SHA-1: c32ce6d3250e37bb92e1c78f25b287200dfbe3c4 SHA-256: 92489255c64be09b3d2276d70eab9dbb533c7fd1db23484d7f01e3c3a96848f3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. One prominent URL, 'https://pelibifir.ru/strik?utm_term=toefl+integrated+writing+topics+2020', is identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=toefl+integrated+writing+topics+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426277/normal_5ff38c065c6aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6012278bc62ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5fd3b1f1630bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_602220c7c71dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_5fdec8e750c21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_60072d579176a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_64a91f43b70446fe89d9d60d3e6e8cb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3850052d-ed5f-4e99-a6a9-a41ba1e22921/does_time_capsule_work_as_a_router.pdfIn PDF document text
    • http://malalepotim.rf.gd/spoken_english_book_in_gujarati_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/32698299019.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/how_to_install_linksys_router_e2500_without_cd.pdfIn PDF document text
    • http://kupemamenigasi.rf.gd/catalyst_9200_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555be0a5-22b6-4f45-82d0-32127c0ca9f9/ancient_greece_pictures_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13cf342-a775-44a9-8252-b0888a5ae4b9/dell_optiplex_gx280_audio_drivers_for_windows_xp.pdfIn PDF document text
    • http://pafapijeneradab.rf.gd/5680566169.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/20140222863.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/dibepor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db511c1-967a-4ea7-9c5e-b7a2ab932613/how_to_use_my_doro_phone.pdfIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_eb770db21fdd47dc9531046074f4622f.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_272cc47441fa483dac086c16dac787a3.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_off0001b73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B73F 5640 bytes
SHA-256: b650413be6c661cbc77fc479328d7fd369eb1611e2f28f735e7e0add04b47216
font_01_sfnt_off0001ca95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA95 12588 bytes
SHA-256: c1545c41c5f7c407cfb614a4aba0c96041e362231c8949bba03c70d091a658d6

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