Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7a6b61b94ad018…

MALICIOUS

PDF

67.6 KB Created: 2020-12-01 16:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46947b7e73c638b21258120ff4529e96 SHA-1: c4d205682819a5afe14ee51744c726dcdd64b680 SHA-256: 7f7a6b61b94ad018e391d5f92b9cf71dc928c89c9873d1d8404128a26a75d6cd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/wb?keyword=platform%20bed%20frame%20plans%20queen
    • https://rowafitiw.weebly.com/uploads/1/3/4/6/134608100/27e6ca522515.pdf
    • https://kutufesivom.weebly.com/uploads/1/3/4/6/134632784/banuxolosexemo.pdf
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/8759037.pdf
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/8150492.pdf
    • https://faxosuxen.weebly.com/uploads/1/3/4/3/134342902/gasitatafisupepe.pdf
    • https://warobakun.weebly.com/uploads/1/3/4/4/134486798/wonitaxe-wafufikekul-soguw.pdf
    • https://zofomuwane.weebly.com/uploads/1/3/4/0/134040850/zevixikaluros.pdf
    • https://kapelomapo.weebly.com/uploads/1/3/4/7/134737659/ziwik.pdf
    • https://rovufeku.weebly.com/uploads/1/3/4/6/134636625/b92b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sevoga/is_my_hero_academia_movie_dubbed.pdf
    • https://s3.amazonaws.com/tetofamuxulil/geologic_time_scale_worksheet_high_school.pdf
    • https://s3.amazonaws.com/fifomi/komakulomogitajod.pdf
    • https://s3.amazonaws.com/napoledunadigo/set_notation_worksheet.pdf
    • https://s3.amazonaws.com/tixedujegibex/reasons_for_bantu_migration.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc07.bin
8bb58de1f8f5aa64928f636ee8542b36ae8bd5d612228c54454ba83a0f6491a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 5456 bytes
font_01_sfnt_off0000de75.bin
2e42fcc90ce3e0d5e5871bfebb964090b4a160227c211089fe9ee89d17dc887f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 10408 bytes