Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d0251de7d89b93…

MALICIOUS

PDF

75.2 KB Created: 2021-05-30 07:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d2e9354e09d3f0c490161bb30c7ca2d4 SHA-1: e03054093373abdaf52a8ff6aa901d7eac5bc757 SHA-256: d1d0251de7d89b93925f4088cb35569bc8242f0c852a0e4e0238a36478eeb2b3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=managing+business+process+flows+principles+of+operations+management+pdf PDF link annotation
    • https://pajarozexukonom.weebly.com/uploads/1/3/1/4/131437235/f4de77fcde00.pdfIn PDF document text
    • https://tewenamizudeko.weebly.com/uploads/1/3/0/8/130873709/84b2f0648e5e2.pdfIn PDF document text
    • https://zerebutaravuna.weebly.com/uploads/1/3/5/9/135965874/daxabazemebavulesira.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/jofaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428035/normal_6000ac0c571b1.pdfIn PDF document text
    • https://lovivusopeme.weebly.com/uploads/1/3/6/0/136095788/jijevetitamezuzune.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/25810089ccbc3d.pdfIn PDF document text
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/c6f74.pdfIn PDF document text
    • https://fuvetozexogix.weebly.com/uploads/1/3/0/8/130874326/9ce4bf3bdd.pdfIn PDF document text
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/zenupiterixezew_jipapuvivireto.pdfIn PDF document text
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/a275210f364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_602fe1d2205d9.pdfIn PDF document text
    • https://zukedobawalot.weebly.com/uploads/1/3/4/5/134526307/6943418.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/d9bc14a4-4559-4cee-94e6-da70df5b0587/how_to_reset_echo_dot_2nd_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095411be-1517-4977-8172-b4c98f2456df/77916022599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f3a00f-7617-454a-814a-40a7247efdf9/how_to_reset_blendtec_blender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/940a1233-d4be-485e-9793-d8c72be9efdc/16915181520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10bde56c-0e17-4dde-b041-b9216e069195/gilevixufozuxijowugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4146ea-3474-4a0e-bcf1-9f291f81655a/94873855875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c856f9-0982-4b99-a151-cc2e97af6370/taurus_g2c_extended_magazine_mec_gar.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_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 5712 bytes
SHA-256: 35cef373e3804e74d1e3383b9db733b4328f95b10bb4cfa7b80c0584f93570c7
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 10368 bytes
SHA-256: f41cb688be31ade17af8256e1bd327a83a37a4b4f509eb53f8937dbeba81476d