Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb326e1f7e6567b1…

MALICIOUS

PDF

81.2 KB Created: 2021-03-15 19:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2d6db178c3368a839a330cfc40c3116c SHA-1: 74c7168401578c04ad80ca97ef38864b8b8aff92 SHA-256: bb326e1f7e6567b13798e3850c2c4b091373b664f71476e527430a862d3868d8
192 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting or redirector services, suggesting an attempt to lure users to malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/award?keyword=basel+3+regulations+pdf In PDF document text
    • https://cdn.sqhk.co/lexebogefaj/hgRihXt/business_plan_competition_application_form.pdfIn PDF document text
    • http://zagodutaf.getenjoyment.net/guguzikenunomuzib.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/dnzhchh/24168374279.pdfIn PDF document text
    • https://cdn.sqhk.co/rafopaluko/5kP2Pie/davukigosasimubet.pdfIn PDF document text
    • https://cdn.sqhk.co/gulijolane/D9ienGD/bubble_witch_2_saga_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_604f7e6f50dd9.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/jaCziab/basketball_stars_arcade_hippo.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/bgg8Gia/mudokukuxisikekovotaw.pdfIn PDF document text
    • https://cdn.sqhk.co/fekerepusa/dS0MIkw/66491932778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_6025b2b2e0370.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/hdpjbhg/yerevan_travel_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490950/normal_60008fe78739a.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/98132005694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5ffe6cf6cda74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393514/normal_5fe3579e7da0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesipobigon.rf.gd/23807638010.pdfIn PDF document text
    • http://voginafukut.rf.gd/hfss_antenna_design_tutorial.pdfIn PDF document text
    • http://nulanajivokavos.rf.gd/46913866571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eba320d-97c0-48c6-af78-9c14f50259dc/echo_grass_trimmer_gt-225_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0075056a-46e7-44c8-9b24-37197bc88931/el_coronel_no_tiene_quien_le_escriba_resumen_capitulo_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a67bc791-e551-436c-a9bd-9afe03e071a1/levatobuvipozewulataxoz.pdfIn PDF document text
    • http://niwibobimitezof.epizy.com/fisher_price_outdoor_slides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f994018c-0d2f-44b4-980e-05aae1bb5aea/game_of_thrones_books_ending_vs_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1fd1b3-8475-4dae-a567-eca7ff7f7a37/how_to_use_victrola_suitcase_record_player.pdfIn PDF document text
    • http://fagaxasugomu.epizy.com/is_it_worth_to_learn_android_development.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_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 5420 bytes
SHA-256: 54dc4723ca028648b8d06263ad65d6953ac830f24844da0ab27198d32a931c56
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 11412 bytes
SHA-256: 6a00bda3504efa25e62f6c4512c4d977ed453aafdc548c1521dc17b53cf8dfee

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