Malicious PDF — malware analysis report

Static analysis result for SHA-256 636660c59d2d90db…

MALICIOUS

PDF

83.2 KB Created: 2021-04-30 22:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 458256c3cbc2954476b03ff52e81ef79 SHA-1: 7d5c313f9d49f4f9c29b45bb8667546d72bb205d SHA-256: 636660c59d2d90db0f812dc3bcffff4eb619da7cd9320488946ef111fc705cb1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites, possibly for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=english+romantic+short+stories+online PDF link annotation
    • http://ch-redirect.icu/watts_premier_ro-pure_replacement_faucetcbzzf.pdfIn PDF document text
    • http://itdiscount.pro/catherine_ponder_prosperity_affirmationsarz5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_6064d3a15e6ee.pdfIn PDF document text
    • https://dunabosugetagek.weebly.com/uploads/1/3/4/6/134601841/4c64946c07ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_603df4d397005.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5ffd52201e2d0.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/5111648.pdfIn PDF document text
    • http://study-english-02.space/employee_equipment_loan_agreement_templatexeph6.pdfIn PDF document text
    • https://kokobeze.weebly.com/uploads/1/3/4/6/134605009/votav-zelegave.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499651/normal_6003fab87fd21.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/7885685.pdfIn PDF document text
    • http://habirovradik.ru/pioneer_vsx_1021_remote_not_workingeljez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/452e92c8-2063-44a1-ab21-3eafb88e4fd5/en_que_consiste_el_nivel_de_lectura_inferencial.pdfIn PDF document text
    • http://vorafudozef.rf.gd/70369478093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e271bb28-a12f-4fdd-a2b1-3e917e0ae69d/whirlpool_refrigerator_parts_at_lowes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2707e89a-5431-4f8f-aa69-4d456bd53dab/toyota_camry_xle_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746179fc-8aac-4bb0-a968-f7de1d964fe4/22989474018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cf4fe8-d0d2-4358-8804-d61c758cd216/pegolorani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4512d5da-dfd4-41ab-8e9a-539521041223/94994206747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ecb4027-a825-429f-a47b-5d47ceb62451/what_do_monsters_signify_in_dreams.pdfIn PDF document text
    • http://kiwozoma.epizy.com/polarity_of_a_molecule_to_its_properties.pdfIn PDF document text
    • http://jibapasugaxelo.epizy.com/rexibadonunez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643cbca1-b737-4f19-aa24-9b9f70ed7518/twilight_2009_dual_audio_eng_hindi_1080p_download.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/pidukefirufukevigopadodit.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_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 5172 bytes
SHA-256: db4bb78e5bee21dd8d7b962fdd695f0f5da228b727cfffda2203f0c1558000ab
font_01_sfnt_off00011aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 10868 bytes
SHA-256: cacce0b3e79947abb5c8f021e133bbb2bf4911131f94f388216dbb6906aad8a4

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