Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd2e565e597e697…

MALICIOUS

PDF

79.6 KB Created: 2021-04-15 10:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8259d165e2ee7540cc96a9ce9a6d8ffc SHA-1: 95ad5a7d42642b1651d9c722f4d82f5c36dbbfb6 SHA-256: abd2e565e597e697b413788fbda0f5f1771db8f629c500fdae3ea6d66d615843
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=situacion+politica+en+el+renacimiento+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414691/normal_5fd828082ed4b.pdfIn PDF document text
    • https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/miwadog-palubetusek-wepuzaj-sakovidoma.pdfIn PDF document text
    • https://nudaduxovusupin.weebly.com/uploads/1/3/4/3/134337963/gapufirewav_fataz_defipiwipir.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/c6a025dac6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_604b9c3ea6ff6.pdfIn PDF document text
    • http://vinograd.io/nokiguwomadesivmltcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_6053c31ccb1ae.pdfIn PDF document text
    • http://on-arenas.com/81523135923asxzs.pdfIn PDF document text
    • https://jerubezefago.weebly.com/uploads/1/3/0/8/130874212/1409548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_6015c22a95781.pdfIn PDF document text
    • http://evilcheats.fun/27271960661emfmh.pdfIn PDF document text
    • http://golden-bridge.pro/cambridge_checkpoint_past_papers_englishem055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_bb4c61c9a98d4f3caa70d95c7e8ef613.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_1312777d9b7e4f9e98cb4285065a105d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/percy_jackson_and_the_olympians_movie_in_hindi_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac866d74-bed2-4c31-89a2-4e72308cfa65/5th_grade_science_fair_project_research_paper_example.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/59567657170.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/monster_vision_augmented_reality_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d10e4e-4bfc-4ef4-af5a-bd4e07ac23af/panasonic_cf-53_user_guide.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_b7f84c988b854367a22a20f2c5ae1501.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80cdf0d-88a5-49fe-a667-dd4a6b031956/how_to_make_your_urine_ph_more_alkaline.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_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 5396 bytes
SHA-256: 5ca6f1a5d4b20bd959fc8e01b1c8f2c5fc678751960bc8162bf2c5c6754697b4
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 12512 bytes
SHA-256: 78861e14df08b985d13068ba5e33ec8c9f3a87eecb2b670f8c37051d649f660e