Malicious PDF — malware analysis report

Static analysis result for SHA-256 13923db2011de7a4…

MALICIOUS

PDF

72.5 KB Created: 2021-02-24 22:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d226e84faa72c88e5432c9d7fcbf847b SHA-1: 06ed434794b0d12fd3776449fad8398cb5baaf63 SHA-256: 13923db2011de7a416e757fbe843e0ea2216b5da9c9bc29321985fcd5b962a19
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently featuring a game keyword, suggesting a lure for phishing or malware. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=boxhead+2+player+full+screen+unblocked PDF link annotation
    • http://bolozofer.22web.org/91599185969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413012/normal_60096ce838c09.pdfIn PDF document text
    • http://tajeromodovo.66ghz.com/battle_chasers_nightwar_party_guide.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/94527942994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fcd9d8e508bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_602d08204ceb4.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/poxuvew.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/6m5gjii/rocket_league_change_music_in_game.pdfIn PDF document text
    • http://papuleni.22web.org/surf_report_hanalei.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/cygolite_hotshot_pro_150_usb_rechargeable_tail_lights.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_601d85b549b33.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/4137873075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486522/normal_5ffb243c08f88.pdfIn PDF document text
    • http://vatosake.iblogger.org/dark_souls_2_cheats_ps4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujapoguxesak.myartsonline.com/what_types_of_intermolecular_forces_are_present_in_ammonia.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/dazizorekimoliperuke.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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 5800 bytes
SHA-256: a0ed57cab9b74bc8b219e8e0c69027dab48e5f64c89f359ddee0936fb3f47afb
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 10592 bytes
SHA-256: c144584ec7e2670e73a34dd1a491f224402934a718995370d58879e5c4f874b5

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