Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e774f8e03a1bb88…

MALICIOUS

PDF

78.9 KB Created: 2021-03-14 10:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f0ce5fd4bf235938ab5dc69e5340e6a2 SHA-1: 289574a873612c9260ec0222ef7e89f0155d3a3b SHA-256: 1e774f8e03a1bb881738febeaaf3d02d5be5e0ae369c1c97ba3768f7cb8393f1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to drive traffic to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://kuzutuzo.ru/strik?utm_term=best+american+novelists+of+the+20th+century PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476768/normal_601720052d96f.pdfIn PDF document text
    • https://cdn.sqhk.co/pumapajewa/chgqXT3/tinuneligesad.pdfIn PDF document text
    • http://copyrightshelpscenters.com/13234739604z9fef.pdfIn PDF document text
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/cfd2ac.pdfIn PDF document text
    • https://cdn.sqhk.co/konosoka/hjih2f2/insta_beauty_photo_editor.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/4622863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5fc942ed97bc9.pdfIn PDF document text
    • https://cdn.sqhk.co/meparifemoji/fJjdg4N/color_balls_3d_mod_apk.pdfIn PDF document text
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/5784588.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/59085567194.pdfIn PDF document text
    • https://gunomelovolif.weebly.com/uploads/1/3/4/7/134735852/wuzabo.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/5Ulhfig/broken_hill_road_trip.pdfIn PDF document text
    • http://hellochildren.online/vupupizomasukixazavoszbabb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_603a831c46a2f.pdfIn PDF document text
    • http://inostrana.com/19303761775zp6g8.pdfIn PDF document text
    • http://fb-ig-violation.com/17390289055gtevi.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/hh3wtji/92630073425.pdfIn PDF document text
    • https://sejuxotanodefif.weebly.com/uploads/1/3/5/9/135957191/5501347.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/acca8b6c-3721-4977-813e-190acca92ce6/cfa_level_1_mock_exam.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/zesixonunir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8975e23d-ed2a-48ae-b233-2ed64f30a0bf/mubexulujagajuterevumiro.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_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 5608 bytes
SHA-256: af8eba0da820d471e40169a8c55b37a5a0ae258e815aa83a16875d4fa687a1f2
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 10600 bytes
SHA-256: 9baa0ee1fa077fd258c6dcb818ca008251eb6dc58be9fd95e06dd623d5d5d632