Malicious PDF — malware analysis report

Static analysis result for SHA-256 7551d5ff1be2510f…

MALICIOUS

PDF

79.0 KB Created: 2021-03-19 09:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 69034c54ac7502411cc2374b9eabcea2 SHA-1: b0804dc83294951f58b2da23be21d34888312a54 SHA-256: 7551d5ff1be2510f873358feb7efde635f6461bbb8b5062072568a4643ae9600
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `https://dafemum.ru/strik`. The ML classifier and ClamAV also flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to workout routines, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=bodyweight+workout+routine+for+fat+loss In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_601f3f57646d2.pdfIn PDF document text
    • http://freshka.fun/rufipotetirapovakczrq2.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/0iafnm9/game_bloody_roar_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/hgjiDig/jungle_jump_adventure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5fd06af5bdf1b.pdfIn PDF document text
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/lirelefebituzuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5ff64b021729b.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/Ejaicjb/smash_hit_game_mod_apk_download.pdfIn PDF document text
    • http://dmgameplan.com/karcher_hds_610_service_manualin4pu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_602695f675909.pdfIn PDF document text
    • http://avlto.best/movizopzkhs.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/82jehjs/65478800362.pdfIn PDF document text
    • http://supportcopyright.net/everyones_an_author_with_readings_3rd_edition_ebook4f5u6.pdfIn PDF document text
    • https://sufexijim.weebly.com/uploads/1/3/4/6/134679247/xojanol.pdfIn PDF document text
    • https://duxujemiw.weebly.com/uploads/1/3/4/7/134743688/9b8816a.pdfIn PDF document text
    • http://gatorama.site/new_headway_beginner_audiopzvo4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/34150095606.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/tv_app_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/twitter_lite_apk_pure.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_ac1ee4bd65fe4a0ab7999f618a5ae85e.pdf?index=trueIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_93451631416d4b9199736b3f4ef62e4a.pdf?index=trueIn 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_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 5476 bytes
SHA-256: a5ab34abab8ec4b6d7d94260c03af4f74b1f9e502e5d48228ce76ed4326bb46f
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 10924 bytes
SHA-256: aeadf6ae8b180fe334f163dfaff5c5a971028b2412355f346e3ac6f7984e2c71

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