Malicious PDF — malware analysis report

Static analysis result for SHA-256 94709a7e53601c73…

MALICIOUS

PDF

82.7 KB Created: 2021-06-04 15:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 811a4d0bb0b915697711f119e40a7473 SHA-1: 21de6348266ac7fd80b3ca22868e950c7ba24c2d SHA-256: 94709a7e53601c73bfe9194223cde153571c7634b88f0aff0207cc0abfd9c645
126 Risk Score

Malware Insights

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

The file is a PDF containing obfuscated content and multiple embedded URLs, with one prominent URL pointing to an external resource. Heuristics indicate it's a link farm and has been flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://infrive.ru/pbw?utm_term=redmi+note+8+pro+android+10+update+features PDF link annotation
    • https://likotemeg.weebly.com/uploads/1/3/4/4/134464786/9726680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_600c74ad78c22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451205/normal_5fe2dd1f7613c.pdfIn PDF document text
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/tobepa_tewoxem_pukokuzotutudit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_6036cbf566945.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nikekuva.pbworks.com/w/file/fetch/144414246/slayer_leecher_v0_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb57268a-239e-4f9c-839b-e3c52c29c4f0/etica_para_amador_capitulo_1_resumen_yahoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e15d387-a0ce-49cb-a0ca-3b764567d063/dojikinarinutumebovewe.pdfIn PDF document text
    • http://zevatirupura.pbworks.com/w/file/fetch/144586869/fuxexepisejitib.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144419148/nuwawujubibokokedadekuf.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/all_i_want_for_christmas_is_you_chords_piano.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144463293/48576495944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21529367-d20f-462f-8b93-382580256f5e/baminolowonefo.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144586074/five_nights_at_freddys_gmod_map_download_no_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7d7aa8-7862-4bd9-817e-331dbdf66303/mawezusupaloxijejenix.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144488031/divina_commedia_traduzione_italiano_moderno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d75078a-3baf-4526-bb2e-78130564567e/jobirato.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/mirijalisam.pdfIn PDF document text
    • http://ludagobef.pbworks.com/w/file/fetch/144554649/acdc_econ_ultimate_review_packet_login.pdfIn PDF document text
    • http://pukagij.pbworks.com/w/file/fetch/144586503/93582284369.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 5552 bytes
SHA-256: 569f0aee85fca06a1c6b126a8cc6600cf430e971d586fd99e1b48a36e8a015f2
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 10664 bytes
SHA-256: c636876269bf3832ff620ac0c57f248aef2f4e5079e026525d9cd999290ecc2b
font_03_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 16920 bytes
SHA-256: 99d50c4195ec1034dac579fedded64b8fc455db7f77d98627fad31e9cc07a68b