Malicious PDF — malware analysis report

Static analysis result for SHA-256 12172cbaa943a9af…

MALICIOUS

PDF

76.1 KB Created: 2021-04-07 23:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d0a6b35e2944fb305bf73d81d18d06b1 SHA-1: 56291c324685fb5148edb7eb6dba7d782347d8e0 SHA-256: 12172cbaa943a9af68de1ba095b916caee4a5a145fc2d21f6588d6ee221593f6
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 0.9991

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 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://ponafet.ru/123?utm_term=big+ideas+math+book+7th+grade+answers PDF link annotation
    • https://cdn.sqhk.co/wubunepan/dCjcicH/rupokuzikipide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451927/normal_5ff60b4823ca2.pdfIn PDF document text
    • http://cashbackmoney.info/vitogilaporutegugekipewn8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370309/normal_5fe3e5096b287.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/4iaQORw/dr_padmaja_kongara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_606d1bc58a90d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_6065054039504.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/hdrkrid/evolutionary_theory_definition.pdfIn PDF document text
    • http://golden-bridge.pro/skyrim_se_crashes_on_savezhkus.pdfIn PDF document text
    • http://agencymedia-ig.com/best_tamper_for_brevilleuhvxv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_60401f287cc51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_605505d6d911c.pdfIn PDF document text
    • https://cdn.sqhk.co/dejojoduzi/ubhipzc/balsac_the_jaws_of_death_drawing.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/auditoria_interna_e_externa_funes_e_diferenas.pdfIn PDF document text
    • http://rentline.pro/what_is_lean_six_sigma_green_belt_certification_trainingfsn3y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_606ae2f2ebef2.pdfIn PDF document text
    • http://pubguckazan.com/how_to_define_a_crazy_personx10gd.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/hdhglgi/31122490947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_601e389c54632.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58f6ed9-40a1-4894-b5b6-6aaa595d8220/50705074140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98bd84a7-fe81-4c74-b669-7c4ecbb4f328/59626803433.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/94253757735.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/adverbs_of_manner_and_degree_exercises.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/mopifalojel.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_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 5632 bytes
SHA-256: 2fc281d3bb97a3524434d34c45256ff4c2b04d2dadfd0ce9c0ed493e0ffa5b80
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 11200 bytes
SHA-256: 6814856a01db860e9bb306ca9f78e380f71d989378a64015809af0834dce5e57

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