Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a87f9482d69dab7…

MALICIOUS

PDF

80.5 KB Created: 2021-04-02 11:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: be89e05ed82d42f1d727083be37a57ab SHA-1: 21713765390883855723479ff6753e00b9f463e8 SHA-256: 6a87f9482d69dab7b0910976bf4d9f95659acd78353ee6136f23d075fddb0352
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=the+book+of+life+cast+twins PDF link annotation
    • http://pifanaliriwabo.mygamesonline.org/the_black_legion_40k.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/88320405986.pdfIn PDF document text
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/puzetebo.pdfIn PDF document text
    • https://nurigefisigutip.weebly.com/uploads/1/3/4/6/134628418/1471700.pdfIn PDF document text
    • https://pipulelinukebe.weebly.com/uploads/1/3/4/3/134364851/6667584.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/3406140.pdfIn PDF document text
    • http://pokinusuvato.getenjoyment.net/37744228132.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/never_be_alone_partitura_piano.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/250921.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/88c9481f-fd4d-4422-beb1-7de0c9b7da48/pride_and_prejudice_2005_movie_with_english_subtitles_free_download.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_c611c27fc0274911bf2395e3228fceda.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_68a93258c4124aafb36549ca69d3c633.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85464a7e-e57f-405f-93d0-e47dca638d04/95758329563.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_bd785d969f754c978698504231de75e0.pdf?index=trueIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_b3287600d3a946739940913deb91d0c2.pdf?index=trueIn PDF document text
    • http://keguwaburafokul.epizy.com/vertebrate_zoology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16fe82c-61ac-40ad-8d71-fd300943b5f9/does_logitech_webcam_work_with_mac.pdfIn PDF document text
    • http://leranijaw.rf.gd/mabaxutegetunigofosid.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_373328718b97462abbfc07b98eee88d9.pdf?index=trueIn 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_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 5116 bytes
SHA-256: 77dcd81618520892e1893b9af92af3a4c7c723f6885031d3bde4f36a80e33053
font_01_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 10572 bytes
SHA-256: e2971362224da503971a3c6b500f40899a274d873c8af06be9472013a80b8993