Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf10b0556dbe3cf…

MALICIOUS

PDF

131.7 KB Created: 2021-02-23 10:27:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 9fc37a1acf62b669ae2f3af3868de030 SHA-1: 9c85cac61da676ce723f318ee2e5144a5e149ad3 SHA-256: 0bf10b0556dbe3cf3d6974bfec62f2ae17651d5549a52ae7f68f80e297130c24
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains keywords like 'insanity nutrition guide pdf' and metadata indicating it was generated by wkhtmltopdf, which can be used to create deceptive documents.

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
  • 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://seumenha.ru/wix?keyword=insanity+nutrition+guide+pdf PDF link annotation
    • https://rokubupudila.weebly.com/uploads/1/3/1/8/131856034/48eb24.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/ca_final_costing_new_syllabus_notesykrg2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467036/normal_60035de739515.pdfIn PDF document text
    • http://momentikshop.space/lifafejuxanadomuklzouw.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/3382308.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/d8ce5f.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/iihe5ia/tefejotonamasiliwegiwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_601fab86ce1f1.pdfIn PDF document text
    • http://yazansoft.com/android_9._0_update_packagexzxa9.pdfIn PDF document text
    • https://mojilizide.weebly.com/uploads/1/3/1/8/131857690/kuxevinele-jolikide-modawitijoz-xumavaniwet.pdfIn PDF document text
    • http://mushygushysayings.com/92292512225r1mn0.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/f6EnyhR/52186522467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fe09c1ad685d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fd622e139486.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/hyjgNUU/can_you_make_pottery_without_a_kiln.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://s3.amazonaws.com/suxugipipolazog/43475128673.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/52429439906.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_off0001b27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B27B 5096 bytes
SHA-256: b4b34fc8d71bf84c51617162d5fbe857406bf96c61347b25193646e94e0341ef
font_01_sfnt_off0001c3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3E2 15232 bytes
SHA-256: 6793747dddf8745de9ec21f1590e2da0c0c1d0d6bf486951f838f496c5c6785f
font_02_sfnt_off0001f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F373 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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