Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8a8080a1da163d…

MALICIOUS

PDF

95.7 KB Created: 2021-03-08 21:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b847a78be2e990dd4c277ca909df17a6 SHA-1: 26b0a672d301a7da859a6fcb5f21a262d70de016 SHA-256: 0c8a8080a1da163dd9f3cce9e4f369020899c29fa49d9d1cdbb315c1817ddae7
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, with multiple embedded URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'graphic design internships' and 'summer 2021', aligning with the lure observed in the embedded URLs.

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://lozipotod.ru/strik?utm_term=graphic+design+internships+nyc+summer+2021 PDF link annotation
    • http://bitsracing.net/loraxejux6dfyw.pdfIn PDF document text
    • http://zoom-omsk.ru/graphing_nonlinear_functions_worksheetruznz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_6046390529142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_6025b27bd6711.pdfIn PDF document text
    • http://item-get.top/71099667171e02uu.pdfIn PDF document text
    • http://trickyturkey.com/zefapanifajaxetpvxtz.pdfIn PDF document text
    • http://urologo.store/graphic_design_software_list_free_download2rzbt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_603f59ce98d04.pdfIn PDF document text
    • http://takipleskazan.org/autocad_2015_for_mac_studentx0kuy.pdfIn PDF document text
    • http://temppicture.xyz/marrakech_medina_mapu13vj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483362/normal_5ff8ad2767ee3.pdfIn PDF document text
    • http://brightshopbg.xyz/ms_access_for_beginnersjkjbk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_60066b7677146.pdfIn PDF document text
    • http://trastqort.online/the_way_of_the_world_summaryvqfkf.pdfIn PDF document text
    • http://rimka.xyz/where_is_the_starter_relay_locatedbczt3.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://uploads.strikinglycdn.com/files/1d20136b-eb97-4e0b-9eae-6f1b0678be70/18350860068.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/new_york_times_holiday_shopping_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e6ab51-8b86-40ac-89a6-854822264bca/pupaxixusububopagexomupoz.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/80764992477.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/wubisejesagipazerosotafu.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_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 5684 bytes
SHA-256: 61d09b9e4ccc56353a070b5627f0a131e0a72f3cbdda9e6bc41e97887dd16e2d
font_01_sfnt_off00013b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1E 11780 bytes
SHA-256: 845350b1450f3d29da1522218d134076c20696ddeb11932ab9e281b9dc690b23
font_02_sfnt_off00016365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16365 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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