Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fb00e71f2c9021…

MALICIOUS

PDF

81.4 KB Created: 2021-03-11 06:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8f1f4b15b09fa5bf6145d40c07937e8 SHA-1: 7e94f3392767a4a8cab83bb50361200567f2670e SHA-256: 43fb00e71f2c90214efdbf74031bd47bf7ddd5ff3a0db8ab5052fa2ffd78a820
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it's a link farm designed to host numerous external PDF files. The embedded URLs and the PDF's structure suggest an attempt to direct users to potentially malicious websites for phishing or further malware delivery. No scripts were extracted, but the PDF's nature points towards a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=struts+2+architecture+pdf
    • http://begemot.space/suvurazevopezapik365tv.pdf
    • https://jepukarebav.weebly.com/uploads/1/3/5/3/135321711/12edca10b315849.pdf
    • http://vashe-zdorovie.xyz/lesson_plan_kindergarten_template8yidz.pdf
    • https://toxekemugig.weebly.com/uploads/1/3/4/4/134484635/rujaxoresukol_wawaxuke.pdf
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/3618456.pdf
    • https://pajotesose.weebly.com/uploads/1/3/2/6/132681045/7e97ebc3343f.pdf
    • https://fozabezadako.weebly.com/uploads/1/3/4/6/134639332/wefusewuxeguguv.pdf
    • https://xidazujagavoza.weebly.com/uploads/1/3/1/4/131453269/7449640.pdf
    • https://zujamapetot.weebly.com/uploads/1/3/1/3/131381682/kimubebipubeveziwupu.pdf
    • http://leopolds.space/selawutagegeladigevekajixjt.pdf
    • http://ionatr.fun/mupoboxorezinefjtw8.pdf
    • http://mufubofawo.iblogger.org/the_integumentary_system_anatomy_physiology_and_function_of_skin.pdf
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/e6b65ec1.pdf
    • https://nujirami.weebly.com/uploads/1/3/1/3/131384028/ranomef-zewimig-vixasuzi-danipiwuloxojo.pdf
    • https://poxosopetijonaj.weebly.com/uploads/1/3/1/4/131453527/mojesemoxemudo-wosipipidak-tusikegez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f006c6b4-ad34-4199-aca2-4cbe17165486/rabbit_hole_bourbon_merchandise.pdf
    • https://uploads.strikinglycdn.com/files/10932b2a-75be-4c8b-b2f6-6474647b738b/magic_tree_house_movie_2018.pdf
    • https://uploads.strikinglycdn.com/files/c0b4e810-0b9e-40ea-b8c8-736e006cb1ba/dell_mouse_ms116t.pdf
    • http://dapaligam.rf.gd/black_feminist_thought_patricia_hill_collins.pdf
    • https://uploads.strikinglycdn.com/files/2bbac75c-6a46-42fb-b27f-d4f18fcf5156/why_is_my_pilot_light_not_staying_on.pdf
    • https://uploads.strikinglycdn.com/files/3baf2e4b-1db0-4c1f-bd83-bcac6d9af56b/imagenes_de_medios_de_comunicacion_antiguas.pdf
    • https://uploads.strikinglycdn.com/files/3f243d04-e3ea-4b93-bc6c-821d1cae339f/can_you_drive_alone_if_you_have_a_permit.pdf
    • https://uploads.strikinglycdn.com/files/48d71812-c58b-4382-a694-a693b1cf35b3/how_the_grinch_stole_christmas_book_review.pdf
    • https://uploads.strikinglycdn.com/files/1ddc286e-fc3a-42a0-93a4-445ac5e69882/aimpoint_comp_m4s_vs_m5s.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_off000101e7.bin
19223ea5dccdfda55fd3dd4dd126098de5e28c245e68c2af21b7c573da56d5e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 5444 bytes
font_01_sfnt_off00011464.bin
e0527954d632e19ed48d3f4cbee7d8e86a7b3323c7e5323ba920c6952d4c294c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 10484 bytes

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