Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d912e4943e70bf…

MALICIOUS

PDF

70.9 KB Created: 2021-04-01 02:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69658930fce0257d00cb0241ee344598 SHA-1: a34f248a57ef14356530ef5a3c74f4b15046ff31 SHA-256: f2d912e4943e70bfa9a8fb38227e07d0e9c19dd1eeb92c78c4c18212729d283c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, with a title related to animal reproduction, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/award?keyword=reproduccion+animal+jica+pdf
    • https://cdn-cms.f-static.net/uploads/4500417/normal_6014ec7a70f36.pdf
    • https://cdn.sqhk.co/fagiseregu/MORijhb/mahjong_solitaire_classic_free.pdf
    • https://cdn-cms.f-static.net/uploads/4470385/normal_605544a8166fb.pdf
    • https://cdn-cms.f-static.net/uploads/4385869/normal_601103da11e79.pdf
    • https://static.s123-cdn-static.com/uploads/4374542/normal_5ff8fc204f7f8.pdf
    • http://hookup681.site/jitterbug_phone_verizon1d45j.pdf
    • https://cdn.sqhk.co/feduminaro/gXehbja/promised_land_landscaping.pdf
    • http://vipadminler.org/ley_de_condominios_jalisco_2020qszw0.pdf
    • https://cdn.sqhk.co/feripamapuv/6Mdtptz/what_can_i_buy_on_ebay_to_resell.pdf
    • http://hopecommunitynaz.com/ge_potscrubber_dishwasher_doesnt_drainnn0dq.pdf
    • http://about-fb-support.com/rc_hibbeler_fluid_mechanics_solutionoy4cj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fb2d7d4e-c481-4d2f-a740-0f2a28319098/10066534598.pdf
    • https://uploads.strikinglycdn.com/files/c51c42ea-ac3a-40d4-93b2-659b5171999a/tifejelijazobupikogik.pdf
    • https://uploads.strikinglycdn.com/files/243ca82b-ebd7-4227-99d5-d051d0013fe7/garmin_echomap_plus_94sv_sale.pdf
    • https://uploads.strikinglycdn.com/files/6c867ca9-db0c-4274-82b6-276c08f3731d/87471384839.pdf
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_5d7f61d96f9e416da0909ddb98317263.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19b4d0ef-3e28-44da-ae0a-8de8fdfbca8d/watch_alex_rider_stormbreaker_online_free.pdf
    • https://uploads.strikinglycdn.com/files/1c661958-8c7b-469d-8762-d4d9da3f5db7/reizen_2_button_talking_watch_instructions.pdf
    • https://a943cdc4-551e-4fd6-8842-bb1c82e441e2.filesusr.com/ugd/a0303e_29ceab77d6504378b3d0deb3e4063666.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a59fbf1-d167-4289-a9b7-9b144e65c4ac/bukatanazoxujez.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_f2fa435864e3474395ad47ecf443eb54.pdf?index=true
    • https://uploads.strikinglycdn.com/files/29e3eb4d-c9a6-4757-8ece-07ff0a680853/formula_to_find_the_area_of_an_isosceles_trapezoid.pdf
    • https://uploads.strikinglycdn.com/files/6738ee21-644b-46a8-950b-0d833e2569eb/anarchist_cookbook_first_edition_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/5680a986-bb6a-4ded-b2f2-994d091c1258/88340111740.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d91d.bin
10442aacf2279c754d0469813f6f413dbd2f3d61247b45c384e00ce64a94fa6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 5204 bytes
font_01_sfnt_off0000eac7.bin
aef2f83f2be19a4d562dcbe08abfd3cbdb61ef8cd8755c0f766315c4de9b4849		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 10844 bytes

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