Malicious PDF — malware analysis report

Static analysis result for SHA-256 d260ccdd2a450802…

MALICIOUS

PDF

94.1 KB Created: 2021-04-02 01:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f04bb0b7f7961a0b5d0ee31b84fcb7bd SHA-1: 905e72692f51d75047ec0682551404058a96ca05 SHA-256: d260ccdd2a450802de35e5ae812bac82a55d2635ea003ccaf19770cf64e05c1c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of disposable hosting for these links, a common tactic in malicious campaigns. No scripts were extracted, but the presence of external links is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=me+talk+pretty+one+day+essay+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483836/normal_60068fb863214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_605260ffe3f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_600fd9dc20559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_602d551ded75c.pdfIn PDF document text
    • http://punejew.mygamesonline.org/99022988587.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496605/normal_5ff7c4e732ec7.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/wazaraxilinanop.pdfIn PDF document text
    • http://playmarket-online.com/perspectives_intermediatetc9yu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500430/normal_6007570b45831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_60663db0cc069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_6015af8dd6633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_60404d3590fbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483088/normal_5fddda7d70bdb.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/how_to_assemble_wahl_clipper_blades_with_springktg6a.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/smart_irrigation_system_using_iot_project_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5ff8dc297cbec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_6015a2d408f11.pdfIn PDF document text
    • http://wirelessinfo.ru/romeo_and_juliet_leonardo_dicaprio_trailer_itada5sm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_6048eb7d97183.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://gulagopafed.onlinewebshop.net/autocad_2020_print_to_3d.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_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 5108 bytes
SHA-256: ba7a3fee19e2d32a5db0a3f0963a3a37cfa59dba81addb958e7d930c1a3117cb
font_01_sfnt_off000137a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A6 10988 bytes
SHA-256: 5fd6083aec5dbeacb8868a81ee6c266ff9a84ae8ce1c5044f4bc83f8b4e57732
font_02_sfnt_off00015ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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