Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c201ede76d28825…

MALICIOUS

PDF

80.6 KB Created: 2021-03-08 01:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 39329dd227a227c895b37580b2661582 SHA-1: 66b6097af3ceb7532cf7fc0f44f35f83882ce1db SHA-256: 8c201ede76d28825c9311bc98f18f423cb8a194f49c69d7bdbfa542e3abb0577
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or redirection service. The presence of ClamAV detection and a high ML classifier score strongly suggests malicious intent, likely for phishing or distributing further malware. The embedded URLs and the heuristic findings point towards a tactic of using search engine optimization (SEO) lures to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=directv+genie+remote+manual+rc73 PDF link annotation
    • https://cdn.sqhk.co/wirubetena/dha2pUs/mowopekogozag.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/52336476308.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/gdGwjeC/zezuximuxarojawupon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368982/normal_5fc5ada4c94e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488317/normal_5fff7b6305151.pdfIn PDF document text
    • http://mifirejetevina.getenjoyment.net/21420091610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_6010758c2480e.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/gje5gen/45846103228.pdfIn PDF document text
    • https://cdn.sqhk.co/kinifukix/higjjbY/apple_chat_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451018/normal_60451dd82db94.pdfIn PDF document text
    • http://fafikup.scienceontheweb.net/digiq_dx2_replacement_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_6024b6336ece5.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/Qiggjja/81831475476.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/83651507322.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/74362483794.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/68406846748.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://xiniwipilanaju.atwebpages.com/32481321061.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_226dd42fc639481281f3f7e4175ed39e.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_25e042f9df784810abef19b800c008ad.pdf?index=trueIn 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_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 5128 bytes
SHA-256: f50e4957ee33d4ad4106f32eeaf1e303c12559f160de0a5d256437afe09a2b64
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 11448 bytes
SHA-256: f253f8036bf025cfd4e6c2cd843366f84093a0b7b8b67fcac81d2c0d164e73a7
font_02_sfnt_off00012515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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