Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38bdf8422ca1536…

MALICIOUS

PDF

74.9 KB Created: 2021-02-07 18:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1ccb18a7cd231e6e88448c9369f4bf1b SHA-1: c9d91af1190f103fe30e3e9aa2ab873eb3f779a6 SHA-256: f38bdf8422ca153699e99b11ceb5242396dd6b63bd9cb094bf863faa3bba623d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/123?utm_term=utah+notary+study+guide PDF link annotation
    • https://cdn.sqhk.co/vinasujitupe/9lgg7hd/electronic_projects_for_dummies.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/ibhdjhL/zepeto_studio_login.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/iaFTiiv/xavodulisalupevatu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401540/normal_600200fdb44dc.pdfIn PDF document text
    • https://sakixuso.weebly.com/uploads/1/3/4/4/134488330/jomenuvuno.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/jeicjgf/tiktok_video_editor_download.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/Cgeih7K/81595639332.pdfIn PDF document text
    • https://muzufuwuvul.weebly.com/uploads/1/3/2/3/132302955/wowuxafidusuboluli.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/gdYLrjb/ninja_samurai_assassin_hero_2_game.pdfIn PDF document text
    • https://kudarori.weebly.com/uploads/1/3/5/9/135960502/sizig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483075/normal_5fce4b9f06e97.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/wiji7ji/zeferanawinelifuwopalaf.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/fq3gfja/55098449332.pdfIn PDF document text
    • https://tazowodogakog.weebly.com/uploads/1/3/1/4/131437711/15417c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_5fe880fc22394.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/DCZggoc/free_gems_brawl_stars_2020.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/dobikasukavu/pajodu.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/coffee_meets_bagel_hack_apk.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_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 5148 bytes
SHA-256: 6661bd2d60be591efcf12d0b1163778bc117eecd1fb8b10fdd69617718d78407
font_01_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 10440 bytes
SHA-256: 503d439e5121af429cde21ac1cc5f22bbc8e4ec3343b471366b4ec973d89eef5

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