Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf8a73bdc752f3a…

MALICIOUS

PDF

64.1 KB Created: 2021-01-24 06:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e4c81b360bef62fe7df782a34f51c2fb SHA-1: d8b96f333927c35eec6fd5a47d494505b07747f7 SHA-256: 7cf8a73bdc752f3a24a929e0e708d332827bbca8fa2db63771ff0e0d467b717c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'traffnew.ru', suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is part of a link farm designed to obscure the true destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://traffnew.ru/123?utm_term=tails+nightmare+comic PDF link annotation
    • https://site-1172455.mozfiles.com/files/1172455/58125697724.pdfIn PDF document text
    • https://site-1168348.mozfiles.com/files/1168348/88306614666.pdfIn PDF document text
    • https://site-1171435.mozfiles.com/files/1171435/b_r_i_d_g_e_unscramble.pdfIn PDF document text
    • https://site-1225924.mozfiles.com/files/1225924/gwent_checklist_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5fedc02f4d781.pdfIn PDF document text
    • https://site-1174463.mozfiles.com/files/1174463/zuvetefodejoxunipexakaj.pdfIn PDF document text
    • https://site-1178773.mozfiles.com/files/1178773/ufc_253_fight_card_diego_sanchez.pdfIn PDF document text
    • https://site-1171771.mozfiles.com/files/1171771/avengers_xbox_one_game_release_date.pdfIn PDF document text
    • https://site-1173456.mozfiles.com/files/1173456/knights_charge_brawl_deck_mtggoldfish.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/jcFigRJ/lock_in_report_definition_english.pdfIn PDF document text
    • https://site-1220496.mozfiles.com/files/1220496/can_you_change_to_word_document.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478716/normal_60047644b89cd.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/VChFWb3/89103279344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_6003b95be97ee.pdfIn PDF document text
    • https://site-1174202.mozfiles.com/files/1174202/dark_souls_remastered_trophy_guide_powerpyx.pdfIn PDF document text
    • https://site-1172154.mozfiles.com/files/1172154/ayushman_bharat_hospital_list_gujarat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuguduvuduwir.epizy.com/hog_head_cheese_nutritional_information.pdfIn PDF document text
    • http://notewewagegev.rf.gd/846577770.pdfIn PDF document text
    • http://doveweluzabakiw.rf.gd/home_inspection_checklist_template.pdfIn PDF document text
    • http://lubesugoninop.epizy.com/funcion_de_las_auxinas.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_off0000c0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D1 5164 bytes
SHA-256: 9247b66f0a91900a8d73ce75d6c9b55b87500468f6b24930909b84428b683f67
font_01_sfnt_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 9688 bytes
SHA-256: 7206081e1c5ecd3f6c4907a7005d636b965ec9af75383e733141631025148171

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