Malicious PDF — malware analysis report

Static analysis result for SHA-256 635dd978e39feac0…

MALICIOUS

PDF

85.2 KB Created: 2021-05-02 18:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 55ca02a7d38b5062fa0e103fb9a6731b SHA-1: 43f010543f1c8c6bd2ab94cea16b1e563b0b7a66 SHA-256: 635dd978e39feac04a7c17fa51ed087795bde9d5a2e79f08b8e36ea3c6c8bdd9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to contain keywords related to appliance repair, suggesting a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=kitchenaid+superba+oven+door+won%2527t+stay+closed PDF link annotation
    • http://theharaka.online/83336843227wjrd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_602875a58d3c1.pdfIn PDF document text
    • http://blancop.xyz/how_do_you_troubleshoot_a_boilervr2uo.pdfIn PDF document text
    • http://front-glass.website/xenuzipadopogobixlgdac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_604cd54ae9d1b.pdfIn PDF document text
    • http://bet-info.ru/85473614519q5qkh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_6016f0b60e0a8.pdfIn PDF document text
    • http://damvglaz1.xyz/arabian_nights_bangla9rrpe.pdfIn PDF document text
    • http://apkweb.net/xixetaw3kilb.pdfIn PDF document text
    • http://lordtrans.ru/wotefewukozagegekewejeya3md.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/hoSjhKa/sweet_house_bakery.pdfIn PDF document text
    • http://copyrighthelpcentral.com/81059003915t3bi7.pdfIn PDF document text
    • http://questotzvezd.space/glast_heim_devil_wing_quest_guideliu8r.pdfIn PDF document text
    • http://e-devletodeme.net/different_types_of_structured_productsckozz.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/jxLl2gj/rcd_russian_car_drift_android_oyun_club.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://s3.amazonaws.com/jadere/99779072617.pdfIn PDF document text
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_92d1b77133514b7fa84073b2052720a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosevud/cuanto_es_un_metro_cubico_de_tierra.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/atrial_fibrillation_guidelines_2017_esc.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/miruxilemupeg.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_4841eb25bd8e4b9fbecc62d2204e996c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/lvo_kill_team_tournament_rules.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_5a218f9ee38d4470bd58b7ec4cc770a1.pdf?index=trueIn 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_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 5440 bytes
SHA-256: 0311c0626ff92bd8772dbb3b23be9f53d579a12178469eccb623af1cf73807b6
font_01_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 13152 bytes
SHA-256: 6f17d56a230ab5bdceda2d9ee1d64eb73dc09cdbfef8bb67db8f6af118def113
font_02_sfnt_off000136fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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