Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7405c38b8d24b9…

MALICIOUS

PDF

76.6 KB Created: 2021-03-22 21:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b8786a2c3a65a74ee840a29ca13a303a SHA-1: 99ab6951ec4ada1a58be12e79df873e8f9375c2e SHA-256: 2b7405c38b8d24b98c37c0ca1e417acbd7ca5e5e870f33095997ccd6fe38717e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The primary URL observed is https://jacksth.ru/strik, which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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=the+exorcist+3+full+cast PDF link annotation
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/lokisem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467586/normal_603acfa0dfa83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425533/normal_5fd1716ce505d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_60199df663e57.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/69947566398.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/2002_ford_explorer_rust_repair_panels.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/1927010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417525/normal_60510fa591572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_602c8aae3f25c.pdfIn PDF document text
    • https://zagusopiv.weebly.com/uploads/1/3/4/2/134234894/3752fddf.pdfIn PDF document text
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/liwita_toxuto_napasarunidi_dimadadunub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_5fe902b7d1b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5fd0a9c27f4ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lukafimagog.atwebpages.com/10144851295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5baad3-9674-4171-8ad5-d3e7ae3f0abd/67427161355.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_bb59b7d27e36499ab527504bbb82b6a6.pdf?index=trueIn PDF document text
    • https://ad5375d1-0dc8-447d-a54b-f1659eeba1ba.filesusr.com/ugd/a4ba79_ab384b8d075048078c07d66b1ec9377b.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_24571e19a4894bcabd786659440d36ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54036d7-5d69-478f-917f-687698539f34/power_book_2_ghost_casting_call.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4333c69-d4a8-4421-a2ea-46dbb4dcf17b/wowonu.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/66045749486.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 5148 bytes
SHA-256: 8b931aa0639177c72d510ed3081825e77206f1460029a7b18272842449c0a2b8
font_01_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 11284 bytes
SHA-256: e66a137ea4626facaaac2f40d6b6209695c7be3d8f68dd07cd094647a110cf13