Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7e67605156ab89…

MALICIOUS

PDF

76.4 KB Created: 2021-06-12 20:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35fc5022307d35c7f551aaac53878669 SHA-1: 9cceb3407d9fbf5a113e57b35875d1d48e163628 SHA-256: da7e67605156ab89598a02de4aa1658bb2144b58ee3ce7e0f8db0e1864d6c1f3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://pistant.ru/pbw?utm_term=last+of+us+tab PDF link annotation
    • https://zolivapodi.weebly.com/uploads/1/3/5/3/135313307/sunorivuganu.pdfIn PDF document text
    • https://tenekivosorudo.weebly.com/uploads/1/3/4/5/134596066/8635818.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/1606970.pdfIn PDF document text
    • https://pikisavejalanab.weebly.com/uploads/1/3/3/9/133986241/bexosepufotuwut.pdfIn PDF document text
    • https://wuzipagaxu.weebly.com/uploads/1/3/0/7/130776492/nobojutajufasuxin.pdfIn PDF document text
    • https://kufojinelimipi.weebly.com/uploads/1/3/0/7/130776518/8468066.pdfIn PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/4975767.pdfIn PDF document text
    • https://pulisojoperun.weebly.com/uploads/1/3/4/4/134487891/kiriwimikireza.pdfIn PDF document text
    • https://surumovosutimu.weebly.com/uploads/1/3/4/7/134733284/7806602.pdfIn PDF document text
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/jaxabozelonomaw_veladulowuwa_posepoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/145047276/nubiraxinizezagujir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f927c2-2550-469e-a591-1b26c8d9fa3a/24164008523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14feb843-2576-4c5d-ae2d-5bf2312b9120/biografia_de_jorge_luis_borges_y_sus_obras_literarias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c5dbc9-52c0-41b0-8c7c-e17797ef34b4/1065063041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3128856d-2d6e-48d8-bea3-d028a451beba/tipirumomogerotudafefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831ce5d1-36e6-4bcb-b22d-c3428357e238/clculo_de_integrales_definidas_basicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d944146-331e-42ae-ac00-60c674874c68/pivuzulop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629e8725-5f01-433d-8034-55c9e5d9cca8/putejoravojasipetazofofad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f30c3bb-4730-49a2-87e4-666447d4e830/kinosikulul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/076c46ca-89e1-464d-a9bb-da3922ece58b/vobilagenovelabiwijaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f38adf-d340-410e-8300-36267ec48c67/what_is_the_best_free_grammar_checker.pdfIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144807771/50706375741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc0992f-6df7-40e5-90b8-d6e24689d4d9/which_is_the_most_coldest_place_on_earth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51540a6-30d2-4301-b424-0a0aff753152/perugakuboneterorij.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_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 4716 bytes
SHA-256: 7c1619925ac989571daadce1a5d9db1abfdf801534ad812e82a0cd629091c30c
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 11168 bytes
SHA-256: 8f1a22fbd57f6833751e3d128f86d550280892202926e17a6e3b9114a9a048fc

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