Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a35af76d5f03a9…

MALICIOUS

PDF

72.7 KB Created: 2021-02-15 06:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e44818bb79584aa34d12a79402fecdfa SHA-1: 82d1cfca2937a8173104af88a2b704b0b53acf51 SHA-256: 11a35af76d5f03a9ea1705373d27dbe5bb907f6e224c33b28ddb68adcdc51f1a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious lure designed to redirect users to harmful content.

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://jacksth.ru/wb?keyword=fussball%20manager%2013%20%20kaufen PDF link annotation
    • http://scandisvet.ru/accident_report_case_number_floridahtyvg.pdfIn PDF document text
    • http://basvuruizleme.online/rulubiwepugakisediligx92ys.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_5fe823368bb9c.pdfIn PDF document text
    • https://wufomuwu.weebly.com/uploads/1/3/0/9/130969972/2429623.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/3Jogcw1/kapir.pdfIn PDF document text
    • http://bigswinner.space/divine_rpg_portals_guide9zy3k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_5fd9c1581c37b.pdfIn PDF document text
    • http://fishing-rods2.club/ink_inc._tattoo_drawing5zdvh.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/hOZgjia/zezawomivamomu.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/lalelajetowisiteg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_601b93eb30978.pdfIn PDF document text
    • http://b4shop.icu/printable_tarot_cards_with_meaningsqxa8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5fd993993d3ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454179/normal_5ffb7771e99e8.pdfIn PDF document text
    • http://itfamily.pro/13254245755z8dfz.pdfIn PDF document text
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/15c0401b.pdfIn PDF document text
    • http://sexedate69.site/sajafofuluduwuvar56bmi.pdfIn PDF document text
    • http://online-bestshop.xyz/buell_owners_manualut5py.pdfIn PDF document text
    • http://reduslim-ufficialesito.site/772663578755e6dr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 5460 bytes
SHA-256: 4d3c2089124744e04e8bde0f91d60432c84daa1f08790b475069f1b20395a1b7
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 10900 bytes
SHA-256: b63ec081ee8b3bc9817cb37f276ce88bacc3635562e8b13d7eeee7a748e86587

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