Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bf5c1085013e83…

MALICIOUS

PDF

81.9 KB Created: 2021-04-05 11:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bda0d38138237f1c900e3ba919c5eb04 SHA-1: 981cc5ce1cf4829a755b3a62094497e26782a14a SHA-256: 39bf5c1085013e830f40c7a7b19caa9e3564a53feb72312e533ccf33ff42a6da
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/123?utm_term=chrome%252F%252F+flags+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462059/normal_5fd961e22ad8b.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/ragaran.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5fc8ecf2d1d45.pdfIn PDF document text
    • https://basexexax.weebly.com/uploads/1/3/4/3/134308464/lupamepupadox_xoloxaw_jewexijozej_gidanara.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/why_is_psychoanalytic_theory_important.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/benolejol.pdfIn PDF document text
    • http://xiwupulo.medianewsonline.com/amharic_to_tigrinya_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/2fjdjdt/motorcycle_speed_record_hayabusa.pdfIn PDF document text
    • https://wamokanudetavud.weebly.com/uploads/1/3/4/5/134510572/69ff0f81ac7ec.pdfIn PDF document text
    • https://nodukuzizowuw.weebly.com/uploads/1/3/4/0/134000349/3272103.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/ghwcogj/nba_2k20_locker_codes_my_career_2020.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/8406359.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/uHsgeIh/zabezijulusowumajojoded.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://uploads.strikinglycdn.com/files/08403a13-dfa2-4600-a60a-019643a5ac49/algebra_1_quadratic_formula_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/acknowledgement_for_report_practical.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/garukuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a025d11-64af-42b7-8cf1-62be67b520ec/pippi_longstocking_costume_plus_size.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/nugofata.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_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 5088 bytes
SHA-256: ddfea4901ec867ba4fa3be98ad464bde66419fe01ae4331af9e85089bc1c649f
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 10672 bytes
SHA-256: 75ce05988d82cf9cec9dd6681e0589843f0e4d60da5ff9e002061a7f1d25c6eb
font_02_sfnt_off00012c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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