Malicious PDF — malware analysis report

Static analysis result for SHA-256 cacbc41282b91d7f…

MALICIOUS

PDF

75.7 KB Created: 2021-03-07 22:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89eb2b4b4ea145fe43bf2b7ddabb42d8 SHA-1: 238046b91fea3787b94c1a0a38a2456e6354f4cb SHA-256: cacbc41282b91d7f0e6f547860357545570a2b5df9e2c7b91e996d9eff3d4682
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The primary attack pattern involves a link farm of SEO-optimized PDFs, designed to direct users to potentially harmful external websites. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/aws?utm_term=divine+mercy+church+manistee+michigan
    • https://cdn.sqhk.co/kojetozativ/MigghZn/tip_top_games_to_play.pdf
    • https://cdn.sqhk.co/wuzosiboweja/QTcihmg/hungry_birds_eat_lick_or_leave_part_1.pdf
    • https://cdn.sqhk.co/vafodagusun/hicUhg8/digdeep_image_recovery_apk_pro.pdf
    • https://cdn.sqhk.co/xagunetoxa/fJtTCoA/la_novella_delle_papere_decameron_riassunto.pdf
    • https://cdn.sqhk.co/nokotadi/iLQjggi/bloody_roads_california_gym_points.pdf
    • http://50offshop.pro/77356561803qee49.pdf
    • https://cdn.sqhk.co/senuziker/g1ibknH/odyssey_sci_fi_mech_rpg_tabletop.pdf
    • https://cdn.sqhk.co/vufisolepu/igdgchg/nalumakirajuzeworutananev.pdf
    • http://bigmagazin.xyz/30589593474xxdno.pdf
    • https://cdn.sqhk.co/teduwugevoki/hfVkfhh/video_maker_app_download_with_music.pdf
    • https://cdn.sqhk.co/luwanuriwaba/yPjaBii/15081401074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_3d514743db604ca49a30c25060fcbb42.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac372c28-ec09-437b-bd87-4bc1a72eb44a/23715357744.pdf
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_b22410cd6efd49f7a6345eb47dd73897.pdf?index=true
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_9c56f18e07484016a9be3d07b8fe7628.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dbf2f9c1-5b93-457a-9777-dd582a2fea2e/17_day_diet_cycle_1_food_list.pdf
    • https://uploads.strikinglycdn.com/files/d8810507-3909-491b-aff3-5e01fc663d9a/pobugimanizikeporudod.pdf
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_f10329e754fa4ef4bedcf8530226df96.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bc14af7d-4a49-4d80-a920-19fad2693e93/cazadores_de_sombras_pelicula_completa_en_espaol_online.pdf
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_9e56782706fa478696792691621f825e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a6dd2ee1-f3c4-4752-8608-cdca00c4409f/69721029493.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_off0000e8a3.bin
94180bb9e0b0e2f273b77c71160d10fc0deda818b68f912daa4b9026195319e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 5340 bytes
font_01_sfnt_off0000fabb.bin
6932bb0f63a13902c2b138ed81d73dad4cb29b07c4975a7430cda3357395c1a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 11428 bytes

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