Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7b3cbe37bc8fcd…

MALICIOUS

PDF

82.3 KB Created: 2021-05-22 05:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 15d09b0bb3995ed8a08f9302d9ed4259 SHA-1: 922d3922dba8047f506f424d6fc48921b2f065d4 SHA-256: 7c7b3cbe37bc8fcdc77fa8a7d94434c7934fccc9dae5346aa36847d838b5da9f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO abuse tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://bologen.ru/strik?utm_term=genetic+mutations+pogil+packet+answers PDF link annotation
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/a29bc7.pdfIn PDF document text
    • https://mufosuxid.weebly.com/uploads/1/3/4/0/134040625/xusominepejamixoves.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_601334d231d09.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/af821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_6052ffc4c78ed.pdfIn PDF document text
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/48696b3c.pdfIn PDF document text
    • https://semebikifotiz.weebly.com/uploads/1/3/4/7/134752265/9932444.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/kisigatajas-xexaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_602e2bab0ead1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5fc8d92b05f28.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://s3.amazonaws.com/wovigebi/agriculture_college_in_trichy_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b1e384-2ce4-4a67-8f5a-7a6667ff5d55/systern_rain_barrel_price.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/94310094617.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/what_is_error_126_on_trane_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/anemia_falciforme_sintomas_e_causas.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/devavejusopal.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/6466587449.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/vibufusalabukej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03076d3f-438c-47db-9f5c-1d668f308ea8/how_to_answer_tell_me_about_yourself_in_call_center_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f89e7d9-7fe0-4dff-bb66-363bd692d32d/metamorphosis_book_chapter_1_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/edenpure_scalerid_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/fc_barcelona_song.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_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 5320 bytes
SHA-256: fd64d714dd4c4193c4b3b1ecddab68bb30080fd2efb4a669389f99d4cfe1bdb5
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 12628 bytes
SHA-256: 1bf106c84c3836217edc8675b5aed81e5095514555d30de196da6b0a945e216d
font_02_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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