Malicious PDF — malware analysis report

Static analysis result for SHA-256 f072d5429cdad7a3…

MALICIOUS

PDF

73.9 KB Created: 2021-04-05 05:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 42bbd8f9ef3e00fb9851e47dfdd605e1 SHA-1: 2790686823a713116cc0c44c250d8c8b21f830c6 SHA-256: f072d5429cdad7a3ef5c0bd53ca00d44b07579078037c1d1eab76629f426223e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=benim+hocam+%25C3%25B6abt+tarih+pdf PDF link annotation
    • https://cdn.sqhk.co/luwesefizi/9MYjeDA/55121822472.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/Diqihhe/pegobodowoziwofovokatapi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456393/normal_600441ef8e4a2.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/re4iajf/cool_math_cooking_ice_cream_games.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/XifYheJ/ruvevufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_6035520f67393.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/es53OM8/walli_4k_hd_wallpapers_backgrounds_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446029/normal_603e642eee6cf.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/cjhhCDm/un_sustainable_development_goals_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/satofapo/cgjqig4/guns_germs_and_steel_episode_2_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_600c8db37d841.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5fefbe32136b1.pdfIn PDF document text
    • http://gavapomapo.22web.org/10980435304.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
    • http://jevesukobiji.epizy.com/biserexenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780bb27d-e9c3-4225-b02b-f38473a910b5/venofusisulezunowosodimag.pdfIn PDF document text
    • http://webowoj.rf.gd/pukegijutobefolenam.pdfIn PDF document text
    • http://dafolilujoxupan.rf.gd/zakofodurukotakop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd762ec-0c09-49fd-b2b4-20da07da71b6/fowakebiz.pdfIn PDF document text
    • http://bijigojufapoda.epizy.com/satanic_bible_full_in_malayalam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 5300 bytes
SHA-256: cb00530513af3bdbe172242ad8d46045735d8d7acb99ada6ce601942948b0554
font_01_sfnt_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 10992 bytes
SHA-256: 12803eee014ac02302aa94591757c03b88717c3120d993db0ef140ae4305c49c
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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