Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e15d6a39f0a28a…

MALICIOUS

PDF

88.0 KB Created: 2021-03-08 15:27:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 12c8276dad4585994649f7c5144be5bc SHA-1: d777f2d0d959ef261a11ef57b0d8e1d9ed734f4a SHA-256: a7e15d6a39f0a28a1637f7cc34fb37b5613f739cee02831a7202127c77f3387b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. No scripts were extracted, but the structure and URL patterns suggest a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://botokaw.ru/wix?keyword=what+the+answer+to+the+llama+riddle PDF link annotation
    • http://shoppingyxplus.xyz/wing_chun_wooden_dummy_price_in_sri_lankao38rb.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/ec15a628.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/the_screwtape_letters_review.pdfIn PDF document text
    • http://littlenat.space/how_to_mirror_draw_in_procreateq2is4.pdfIn PDF document text
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/5483185.pdfIn PDF document text
    • http://instasurprise.online/nijajotesegivozobe0wnwa.pdfIn PDF document text
    • http://sutarakikim.scienceontheweb.net/which_kitchenaid_mixer_is_better_for_bread.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/hjiigQP/bobixeladu.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/igeNieN/60597918829.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/9l3hTxM/next_big_fighting_games.pdfIn PDF document text
    • http://biweekamnf.com/xadubilaratesejujuvjf00.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/92784612956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2c4a3724-dfb6-444b-8b1d-5970fc071d6a/arris_tm502g_ip_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/568af990-89db-44a1-b85f-d81acf740eae/tabela_fator_de_correo_monetria_tjmg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e8a701-548a-466b-b592-2fa02e41a3e6/froggers_adventures_temple_of_the_frog_gba_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62201d1-2743-4d16-b122-c33942349a66/baxonetitixisuteso.pdfIn PDF document text
    • http://pajamenu.rf.gd/boosted_performance_kit_370z.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6896596b-7d7c-4371-95f8-177b0e510dba/taylor_body_fat_scale_5596_manual.pdfIn PDF document text
    • http://xonafalapon.epizy.com/formation_barman_cocktail_paris.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/wekeginogizipovugugeviluv.pdfIn PDF document text
    • http://vimomata.rf.gd/how_to_use_black_and_decker_start_it_jump_starter.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 4960 bytes
SHA-256: c7c20bb8f83514eea05a88d0b7778d6a024aa9b3c9d4a2f1682a9a699d85a11b
font_01_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 11580 bytes
SHA-256: 10738d0dfca542ccb9e505a05f8ab6480b3100e12b1eb8c54a7ab0d891a8a8c1
font_02_sfnt_off00014480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14480 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361