Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab16a3384e27fcb0…

MALICIOUS

PDF

76.4 KB Created: 2021-04-27 17:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d5066cbc31ce5dc8ce9c7e477ca7de0 SHA-1: 7cfaa879d9fdd03e2bbf07e55da8022b93d83324 SHA-256: ab16a3384e27fcb0b7db81db8b41fbea98c138efdd60dbd997032fa7fb5ee863
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as SEO-friendly content, suggesting a link farm or phishing operation. One prominent URL, 'https://pelibifir.ru/strik?utm_term=philips+norelco+multigroom+5000+guards', is likely the primary malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=philips+norelco+multigroom+5000+guards
    • https://cdn.sqhk.co/gabebutiz/yhdvigf/gomedidifabuwo.pdf
    • https://puwikopigab.weebly.com/uploads/1/3/1/1/131163601/47df3.pdf
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/weganatin_jiroboka_fatudeririv_butozok.pdf
    • https://jenevokitajawol.weebly.com/uploads/1/3/4/2/134235402/wipudibotijet-simotafiriwi-veretexugawano.pdf
    • https://cdn.sqhk.co/fumamimed/0gcWcif/mecoo_live_match_meet_enjoy_realtime_chat_now.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/redegelesibif/how_do_i_silence_my_apc_alarm.pdf
    • https://s3.amazonaws.com/fodose/how_to_replace_battery_in_seiko_solar_watch.pdf
    • http://boxitevu.rf.gd/vepafogonofuxuruwo.pdf
    • https://uploads.strikinglycdn.com/files/4043e4b4-bfbb-4ba4-a6d1-b19cb1410242/2008_jeep_wrangler_engine.pdf
    • https://uploads.strikinglycdn.com/files/e94bfa76-d720-4039-8646-ac0be1370da9/plantronics_voyager_pro_pairing_not_working.pdf
    • https://uploads.strikinglycdn.com/files/f96edded-0f95-402b-aff4-43e8ee42ee2e/mortal_engines_book_2.pdf
    • https://uploads.strikinglycdn.com/files/aa7a2e1c-8abd-44f0-bafc-11a4fefb86fe/what_does_quantum_physics_mean.pdf
    • https://s3.amazonaws.com/tokudapele/cheap_motorcycle_helmets_for_sale_near_me.pdf
    • https://uploads.strikinglycdn.com/files/683995b4-0afd-45ff-bbe2-0769853a73a5/how_to_fix_iron_steam_button.pdf
    • http://wigezenefibi.epizy.com/72675864722.pdf
    • https://uploads.strikinglycdn.com/files/31896255-c811-4864-95e2-3620f06dc078/52065291268.pdf
    • https://uploads.strikinglycdn.com/files/e87ab43c-4905-4411-a892-bd7a2a520115/fomoluxewaxumejejunigo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1c.bin
12f561af1f4b16cec3ba3c52bef577326b0f3e5a0e7e1491197bc43abf6ea917		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 5636 bytes
font_01_sfnt_off0000f107.bin
13c6a2a2d3dab71c47cfbc557a0c27ac0ec33ae3803e3bfb73f8c4f43b79bb7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10912 bytes
font_02_sfnt_off00011625.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 4324 bytes

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