Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b9aca7977105a9…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 23:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05ed5aacc1b03d825f87b6590b4ebb4f SHA-1: bbd8c51fba11cc82a79986041d27e1379ff685c5 SHA-256: 15b9aca7977105a94a7f2596e0dd4b631727272e1c693dd28272effae7334eb6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely for phishing or distributing further malware. The document body, though heavily corrupted, suggests a lure related to 'general chemistry crossword puzzle answers'. No scripts were extracted, but the presence of many external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=general+chemistry+crossword+puzzle+answers PDF link annotation
    • https://cdn.sqhk.co/gixezovof/jgyEgfC/filling_in_holes_in_walls_before_painting.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379485/normal_5fcad5b3bd5a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5ffe414681b88.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/t3hvjeD/71099568493.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/h7jgidj/galaxy_wolf_wallpapers_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/aVhgbUs/zojemerim.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/jbOjgic/35361580727.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/gflbzUI/yoga_108_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/fjjighd/19315718044.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiwuximu/jwgeH62/diwosikezetamek.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/ginutu/pukijemusuzazarajapuka.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/vamozuperizi.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_7cd9c786826f441f93cc87a6c3709ae3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2168845d-0558-4ddc-a01b-c1120d5d4b7e/17627719888.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_84af944617d24530bf1cf6aac9278929.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d87307-af04-4831-865c-c3c3ddc2d025/58035865025.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/pajigujodaveveroxinuvidu.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/banshee_saison_4_vostfr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235bb99b-cc80-4219-9eeb-b851c497f06e/9699510123.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/butajesogusupodalesirazob.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_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 5588 bytes
SHA-256: b124b00c01e89024547ee4007f83c41906d1651de53c4a6aae9196fd08d9d002
font_01_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 10616 bytes
SHA-256: 21de801b7879b7b3d289cae1244a90e7f3149c111e3821a9403b803c8445726f

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