Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7faf0f5335ad2d…

MALICIOUS

PDF

77.0 KB Created: 2021-03-11 19:13:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca2a4c907aab1ac67d20326341342bc0 SHA-1: aa424a66cd68bdd91dd87190afa000d21e9e4c1d SHA-256: 1e7faf0f5335ad2d5e631e421fc87e60046573eea80d78ac1f8a99466a95be6f
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with a critical finding for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV also identified it as malicious. The embedded URLs, such as https://xajibur.ru/award?keyword=zend+avesta+pdf+italiano, suggest a phishing or SEO manipulation attempt. Although no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/award?keyword=zend+avesta+pdf+italiano PDF link annotation
    • http://hookup754.fun/how_can_a_book_make_you_feel1cxtj.pdfIn PDF document text
    • https://dilaxizinis.weebly.com/uploads/1/3/5/9/135973905/e3102f45c.pdfIn PDF document text
    • http://coupons2020.info/the_little_match_girl_questions_and_answers_icse_hubzb1vl.pdfIn PDF document text
    • http://tameenegypt.com/68970242662dw2au.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/where_is_the_volume_button_on_panasonic_tvq8b7h.pdfIn PDF document text
    • http://afracheat3.xyz/6077271200534ti8.pdfIn PDF document text
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/6202478.pdfIn PDF document text
    • http://just-gopro.com/stihl_backpack_blower_br_700_reviewsrwfln.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/3439615.pdfIn PDF document text
    • http://chambrehq.xyz/schlage_keypad_door_lock_not_unlockingvm5h0.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/43873f13-09fa-4da0-9b6f-149e08c91bc6/usmle_step_1_dates_2021_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899fe490-d570-4bc0-bf12-154314d643d1/best_answer_for_tell_me_about_yourself_in_mba_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12cdbb1-5a28-411b-9b47-7ffe7798e86b/xegekikovipepijejodotas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb990b4-9d72-4019-a344-92712c97caf0/jeep_wrangler_body_parts_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb19fee3-7c2c-45e3-9f57-9a385ff21889/polytune_2_manual_espaol.pdfIn PDF document text
    • http://datasixiva.epizy.com/65063189243.pdfIn PDF document text
    • http://bubewap.rf.gd/rojojif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d3595d-6bb7-42bd-a8c0-b50f7e297aaa/fudivevazimodekivadak.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_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 4956 bytes
SHA-256: e6b4e8d2631c43e11f0605193ca55c276310471d505bdcf4b08fdc4abfcbd117
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 11696 bytes
SHA-256: 63070a1d30c7e4daefb593e127d139610b437848c6cba3087e10b54c363b79f0

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