Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f235d7d7b00a278…

MALICIOUS

PDF

77.2 KB Created: 2021-03-11 17:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 628d63c2fc987699be35a7604b6e8fa3 SHA-1: f153caa3154471977dd842ed4991cae8e31ff315 SHA-256: 8f235d7d7b00a2789b61eddcd461494b7a2aaf1aa56179c83db2fa3e1786d2ad
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that point to disposable domains and known malicious redirectors, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are typical of lures designed to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://yafferge.ru/award?keyword=b.+com+1st+year+syllabus+2020+pdf In PDF document text
    • http://frontend-developer-azaynullin.site/8339162562611kj.pdfIn PDF document text
    • http://heliusdesign.ru/67030952464y3feg.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/94821589871.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/relion_confirm_meter_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_6016fdafc995c.pdfIn PDF document text
    • http://teleporttur.ru/77822784645t1eth.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/82912195788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_6002e5dc85e8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_6001068ba0a7f.pdfIn PDF document text
    • http://bamiluzigu.mygamesonline.org/todays_national_news_headlines_in_english_for_school_assembly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_6010e5c85a06d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd6584fe3cef.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/eI2usbp/97772973392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_6018d27c955c5.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/blister_in_the_sun_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/BAzjjjb/mobile_wallet_defined.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_600da93403106.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://zejibanunepi.myartsonline.com/how_to_level_lockpicking_rogue.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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 5948 bytes
SHA-256: 6a1a0971a1ccb28fde12a0937490b6d4af1cc56ebac137398a3309eb8d7d8c4e
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10564 bytes
SHA-256: f19c9b47ae8b345db716bd3ef4eb97f9a63fee397a2c035491714d28633c9fa7
font_02_sfnt_off000118bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BF 3948 bytes
SHA-256: bf79e96a7df7be6c2d30d777fe7f78d39eaeaf33e916b70b12e0febc5057387e

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