Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d45904bdb1400f…

MALICIOUS

PDF

66.2 KB Created: 2021-02-24 02:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 57d4ac384d552fb9718ecba55bac616b SHA-1: 5076b0fa592ba68d0181b79a34451ca14a6dd53f SHA-256: 11d45904bdb1400f0071a8176ae7b31e2d4b15214516ddf6d5736cfbbab10eef
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment. No scripts were extracted, but the overall structure points to a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=cach+lan+hat+man+coi+pdf PDF link annotation
    • https://cdn.sqhk.co/lisesemafo/iickjgV/mini_basketball_hoop_nets.pdfIn PDF document text
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/borugo.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/wufikad-lijapuzepexep-jomoveratisotek-ludanizuxa.pdfIn PDF document text
    • https://xowasesulozuvuv.weebly.com/uploads/1/3/5/3/135347394/revakabonedabe-raxor-tanikotuzakage-zinubel.pdfIn PDF document text
    • https://cdn.sqhk.co/walamalesumi/S8VzEjb/kid_videos_funny.pdfIn PDF document text
    • https://cdn.sqhk.co/sofopiro/iahf2RB/dragon_hills_2_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/oLAcFge/don_t_starve_shipwrecked_tips_and_tricks.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/gjhihhc/galaxy_on_fire_2_ships_best.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/MsjajgB/donkey_kong_best_unblocked_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5ff0c843c9077.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/JH7hJji/sup_game_box_games_list.pdfIn PDF document text
    • http://mon-compte-cmb.best/baladoor_telugu_movie_hd_video_songssn2wc.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/jclFTxb/cats_play_with_their_tails.pdfIn PDF document text
    • http://contentmedialiteracy.com/graphing_quadratic_functions_in_standard_form_worksheet_docvleov.pdfIn PDF document text
    • http://organicnu.info/clarinet_sheet_music_easyir200.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/gigchje/steak_knives_uk_shop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 5024 bytes
SHA-256: 52fc5e7863af8ee463ff664c124950020678503436db408aa1cb4bbd3b4d10ab
font_01_sfnt_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 9792 bytes
SHA-256: 7ff180972d235df1e20eaa051669617eb86a9db40099c06cbc7dc8e7ae535ec9

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