Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf785a50a7928ce9…

MALICIOUS

PDF

75.3 KB Created: 2021-03-06 21:36:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 71b83b81baab27e4176600910bc5567e SHA-1: 8ca1f1e9c325a64d06eb57b62979d39fb1dca4e8 SHA-256: cf785a50a7928ce9d4eb36112a9614bf0222165bf70a25128b7c05e22fc6a383
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the PDF and its embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment.

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 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.
  • 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://druttle.ru/strik?utm_term=storm+cat+generator+spark+plug PDF link annotation
    • https://cdn.sqhk.co/kewawukufiju/dkHF9o3/1172031074.pdfIn PDF document text
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/puwaxuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409403/normal_603d18108eeff.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/5410754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_600f90495c50f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5ff470ff226cd.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/gdpiCIO/offroad_pickup_truck_simulator_unlimited_money.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/3809766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386330/normal_5fdf9995eb26a.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/CLjeghk/hornblower_series_1_episode_3_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_601e6dbac04a6.pdfIn PDF document text
    • https://cdn.sqhk.co/vajegipofuz/ogcqjbN/bombastic_antonym_meaning.pdfIn PDF document text
    • https://zexerimapepu.weebly.com/uploads/1/3/2/6/132681444/2fb02082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/education._com_science_worksheets.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_fbf00ed2515e41328d412758ec8c77dd.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_6da9aab4e4a544fba3270e35be8c3e37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vasofirida/anuraga_karikkin_vellam_movie_link.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/kotepivejademivusevemo.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/38327523057.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/22324603028.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_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 5420 bytes
SHA-256: 218f7ca85376ba4e2718bdcf00893dda5e73f17bb46f2e42f40cf72daea52b73
font_01_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 10460 bytes
SHA-256: 874074003ca8c7df7fb80fdab05cfb632d4ac14fe0cb07935327608c489041da

Open this report in the interactive analyzer, or submit your own file for analysis.