Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f076969186d0c88…

MALICIOUS

PDF

67.0 KB Created: 2020-12-15 20:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e33a07700fdf9bf30195c1a1021bdd15 SHA-1: 77fd1609be5f274be353731e5e56f27c6b52f9bb SHA-256: 8f076969186d0c888effe3ce503aab309b890545c071556ed8dce3c6504ced1b
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 pointing to PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL 'https://traffnew.ru/aws?utm_term=4+types+of+sentences+worksheet+5th+grade' is a primary indicator of the malicious destination.

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://traffnew.ru/aws?utm_term=4+types+of+sentences+worksheet+5th+grade
    • https://bubamixidik.weebly.com/uploads/1/3/4/6/134657394/fowiji_bikonet_pibosebavu_zezuvasezedemem.pdf
    • https://bugalesatu.weebly.com/uploads/1/3/4/3/134309104/zobutotidepigaf.pdf
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/riposov_wijudigolujupur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc7a6f210d6a92a736d5b18/t/5fcb0d2236758319a54c46fc/1607142691034/8710169744.pdf
    • https://s3.amazonaws.com/liwafo/bushnell_banner_3-9x40_walmart.pdf
    • https://s3.amazonaws.com/zetare/sifikatagafosijopisameju.pdf
    • https://uploads.strikinglycdn.com/files/75f4db73-e217-4b2e-9572-108103e47174/kijumawut.pdf
    • https://static1.squarespace.com/static/5fc3690c2e537a05ef19187d/t/5fc66832f8cdb769c6bf81d7/1606838322964/18941543598.pdf
    • https://static1.squarespace.com/static/5fc1050bab79f442f22a407f/t/5fc85c682dd5737571b205ab/1606966376869/naughty_boy_lyrics.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0e9672f8b574a0f5bc08/1606225560946/gosafovilokifukojomodebiv.pdf
    • https://s3.amazonaws.com/susopuzupure/ballot_template.pdf
    • https://static1.squarespace.com/static/5fc0e1846b97992eb55bfc03/t/5fc106a564571256545fecbd/1606485674413/8541614579.pdf
    • https://s3.amazonaws.com/debamijizozexo/canon_selphy_cp810_printer_software.pdf
    • https://static1.squarespace.com/static/5fbffb205e8e827d4288adb3/t/5fc429d0e6d49a06bb15ee96/1606691280923/disability_awareness_merit_badge_pamphlet.pdf
    • https://static1.squarespace.com/static/5fc123f2e2fce462bc8d6747/t/5fcdbbd8f94b6402b2397ad7/1607318489964/rudolorirubuva.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_off0000c836.bin
a32e9731ebafffa08430d709bd2e6b7d4e41323a535ae445f45874972455235f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 5760 bytes
font_01_sfnt_off0000dbff.bin
aa513c65b11ca6fbb09f1d38df044e6e1320b7860a296babea8acc0cacb128ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 10136 bytes

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