Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c65e889a62ef67…

MALICIOUS

PDF

75.0 KB Created: 2021-04-01 16:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e92e07ca938e1ee9bcccbf62e7643c45 SHA-1: ee52b993b5b039f15b7d61a2a214a1e54444389c SHA-256: d1c65e889a62ef6781f3c94baebb43001f455ea522234b481fac4c1e7f04dfe8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and numerous external URIs point towards a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=cia+human+resource+exploitation+training+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/ribobujir/c8wiaJI/getezo.pdfIn PDF document text
    • http://doordash.link/zaneruraxudegukifevugul0bgx7.pdfIn PDF document text
    • http://mirror-x.org/probability_and_random_processes_scott_miller8a5bf.pdfIn PDF document text
    • http://uptodate.site/756017290341tbqg.pdfIn PDF document text
    • http://my-favshop.online/public_gem_mines_in_floridakg6hq.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/class_5_english_grammar_bookw2p08.pdfIn PDF document text
    • https://cdn.sqhk.co/melivetipi/AF3jTji/science_learning_worksheets_kid_super_scientist_worksheet.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/suvepat.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/ijLijig/sifogemaririgumakejug.pdfIn PDF document text
    • http://reduslimitalia-official.site/291946655091ccoi.pdfIn PDF document text
    • https://cdn.sqhk.co/takodabu/fazjihN/mimodu.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/xobulojetarob.pdfIn PDF document text
    • http://pc-remont.website/vagiguvajr0z7b.pdfIn PDF document text
    • http://begetus11ppz.xyz/how_much_money_did_frozen_2_make_worldwidedb7kc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_ee5b4745ce8944eb8e758bcca948bf70.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_43c8ebb3f5a24e01867295f38470c3bb.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_d4f9251b1e8040f1834f82af8869d8bb.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_1ee2cf9f51194902a5641639b66d2dfb.pdf?index=trueIn PDF document text
    • https://6a543b89-810f-4a07-932c-4cc129fc401a.filesusr.com/ugd/1e5726_206281dc456b44ddaf36e99b64fae551.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_f87873b1755b463abc75d6ccbc5acf10.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_01e1f82ee1c1467eb95d0e7eb5d12cc3.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_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 5540 bytes
SHA-256: cacbbaf6359e7fd59817b5e49260209612165d80e656ab232961295b8ed1fe32
font_01_sfnt_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 9884 bytes
SHA-256: bbc434950c98e75db5a52b62d68d48d71466d7ff30aa93a568a1d5ad75d790f9