Malicious PDF — malware analysis report

Static analysis result for SHA-256 625b822a6e7d45d9…

MALICIOUS

PDF

119.5 KB Created: 2021-06-07 10:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 207a5c806887959130d2c4c73ab18801 SHA-1: 9dc8647788bc2836daeebfc2e7009f10e6543b45 SHA-256: 625b822a6e7d45d98630bcab731fc0434b22b0ef783ae2b5bc9311e36d65cead
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://irlanc.ru/pbw?utm_term=the+accessory+muscles+of+respiration+includes PDF link annotation
    • https://bomirilipaxotez.weebly.com/uploads/1/3/4/0/134096722/viwejupas-tisabedala-gumetojazubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5feba3b973f73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5fcff4444ee06.pdfIn PDF document text
    • https://nuzewotamomumaf.weebly.com/uploads/1/3/4/7/134701518/6713042.pdfIn PDF document text
    • https://pojebozotez.weebly.com/uploads/1/3/2/6/132695867/d1889886.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/makagatetexemebapoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_60b86f791b622.pdfIn PDF document text
    • https://sosubewuwebefa.weebly.com/uploads/1/3/4/3/134360265/dd5cf147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_601d5b488f2bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_604b8c6eea995.pdfIn PDF document text
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/4510559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461202/normal_6005dc8330001.pdfIn PDF document text
    • https://gulawunobuxag.weebly.com/uploads/1/3/4/6/134627092/1119942.pdfIn PDF document text
    • https://dewubolisevibe.weebly.com/uploads/1/3/4/3/134318954/2410733.pdfIn PDF document text
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/merirateri-wibewexumekugub-webefijafa-pifenati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_60410d83645c1.pdfIn PDF document text
    • https://kebakiwaranug.weebly.com/uploads/1/3/4/3/134317860/wikevati_wufosafegaxesop.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/7ee8452b-e8d3-47b3-9f14-d85b35a9f07f/92787396481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6ed169-94f6-406d-b80a-34f7e3ea671b/jetekuzodubepanujovadisev.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/how_to_learn_french_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6996abd-0c97-4380-9ca0-78ce4a6ad485/kamasutra_el_arte_de_amar_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeaec81d-f45c-47cc-8450-1a619e7d1142/bhola_hai_bhandari_bhajan_geet.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/69789729998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b686c9ad-acdd-4c48-b0eb-099bbc337475/thinking_for_a_change_class_dallas.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/f/misexi.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_off00019404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19404 5444 bytes
SHA-256: c1089226677f3c3130e2a93ca87f9fc353521976d091d66bf004e270d9134db6
font_01_sfnt_off0001a666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A666 12284 bytes
SHA-256: 355600809a98f5f00fe407e9ae2f13ac5bb4682646e89103238b756b6bc65973