Malicious PDF — malware analysis report

Static analysis result for SHA-256 07aaa02bd462d321…

MALICIOUS

PDF

73.7 KB Created: 2021-06-01 13:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58dc4ce7d12b7706fba6f8608d04ef26 SHA-1: d0c1921940836be5b338ad1ce6e29ffae381040c SHA-256: 07aaa02bd462d321b3146a54f77415830d4e994389237a89536cf7afd7480587
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier flagging indicate malicious content. The embedded URL 'https://wastran.ru/pbw?utm_term=ms+office+2016+download+for+pc+32+bit+windows+7' strongly suggests a lure for software downloads, likely leading to malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://wastran.ru/pbw?utm_term=ms+office+2016+download+for+pc+32+bit+windows+7
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/3122504.pdf
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/87758cff7b9.pdf
    • https://sepadobifivak.weebly.com/uploads/1/3/4/6/134612103/2b3db2215448.pdf
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/wisawejisevub_mimodu.pdf
    • https://mepurukog.weebly.com/uploads/1/3/5/3/135306658/jodisudelopubusax.pdf
    • https://mozalotajevel.weebly.com/uploads/1/3/2/6/132682758/vilop.pdf
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/liduzapibapeko.pdf
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/pizagisaguk.pdf
    • https://mirotipobidonep.weebly.com/uploads/1/3/4/9/134902528/wixexitamatawive.pdf
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/04afd6.pdf
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/7da3d20716.pdf
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/terufuk-rikubaduf-nuxusid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2eba343a-d939-42d8-a13f-8af381d5f2a2/do_androids_dream_of_electric_sheep_summary_chapter_1.pdf
    • http://zajozote.pbworks.com/w/file/fetch/144456624/48688170104.pdf
    • http://zewalar.pbworks.com/f/26326151440.pdf
    • https://uploads.strikinglycdn.com/files/c78888ea-a742-4e9f-96b4-a99eb72627a7/what_is_the_best_rechargeable_stick_vacuum.pdf
    • http://letonepamusi.pbworks.com/f/dunudukirifufaga.pdf
    • https://uploads.strikinglycdn.com/files/7762f55b-a0fb-4339-a657-ca64b499378f/english_vocabulary_in_use_pre-intermediate_and_intermediate_book_with_answers_and_enhanced_ebook.pdf
    • http://lekipirunezi.pbworks.com/w/file/fetch/144414402/joderugumodomodibijowi.pdf
    • http://kapetipubi.pbworks.com/f/flexible_work_schedule_agreement_form.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e020.bin
d7e1b6636424c96ce256c4172db5f5e22cf3e125cbe39cbd09263247793a0635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 6112 bytes
font_01_sfnt_off0000f51a.bin
0b8c065b11fd55e7d6667a7c16467a1d507c17e9112e3e9492d443beb398a6d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 10564 bytes

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