Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f0643da06739be…

MALICIOUS

PDF

78.6 KB Created: 2021-02-19 16:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 841d26f52d19183715aeec3045d76d4a SHA-1: e6d7882c679979b9663c811c0f51f9139a396b8e SHA-256: 17f0643da06739be5835520654f0bc6c66c96e25c2a9c5bc56c20c34b9c79f64
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'seumenha.ru'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM' indicating a large number of external links, suggests a phishing or scam attempt. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of external links is a strong indicator of malicious intent.

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 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://seumenha.ru/wix?keyword=human+body+organ+worksheet PDF link annotation
    • https://rajarajo.weebly.com/uploads/1/3/1/3/131398110/bosipevava.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/c0DStct/full_hd_3d_wallpapers_1920x1080_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/ZEjdvpx/wisepuxuzinifofafegez.pdfIn PDF document text
    • https://cdn.sqhk.co/nulegudup/qhTja33/ocoee_florida_demographics.pdfIn PDF document text
    • https://susominen.weebly.com/uploads/1/3/4/7/134714937/4011799.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/7hbBje1/62700948116.pdfIn PDF document text
    • https://zaronubiguxade.weebly.com/uploads/1/3/4/6/134685024/1490015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/32421492821.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/old_genie_garage_door_opener_learn_button.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/mhr_math_textbook_grade_7_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/vadojone.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/65322038785.pdfIn PDF document text
    • http://tuzipani.rf.gd/64157347376.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/travel_consultant_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/78102171756.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/fixokasunal.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/vobonafisok.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 5564 bytes
SHA-256: 2e22f269337f9d877a82e0c899fafdb50e20f26d089141e9b2e4f7f2ac27bbd0
font_01_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 10328 bytes
SHA-256: d1bda54c4425693c6ecec365edf2eccc78e4fe05a904e0629ba74ebed7b35c0c

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