Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6db8e520d1fa714…

MALICIOUS

PDF

78.7 KB Created: 2021-02-24 17:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bfd108c7e2e9267d0019244761945572 SHA-1: bf5537e1ec08df1ce6cd31b18171fba6e61e7bb2 SHA-256: b6db8e520d1fa71404f33dded52b232254ba72437b1e7ae06c28d8086c146956
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm and a high ML score, indicating malicious intent. The presence of numerous external URIs, particularly those hosted on `cdn.sqhk.co` and `weebly.com`, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI findings strongly suggest it's designed to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=diehard+portable+power+1150+user+manual PDF link annotation
    • https://cdn.sqhk.co/gixelotopa/ZghJwia/dufurematumure.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/totibovefokugis_dufovodo_satedono.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/YjekdAA/varoju.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/7e4785e.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/eheja63/snowfall_new_season_premiere.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/ghbLhau/barbie_dreamhouse_adventures_season_1_episode_6.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/aieib8N/world_s_hardest_game_speedrun.pdfIn PDF document text
    • https://cdn.sqhk.co/tadeketoxab/lgfgeNH/gamedisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/banjara_bana_diya_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/lexicon_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/myegy_windows_10.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/pewulumugabokapaga.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/cardiff_sixth_form_college_boarding.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/76390424705.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/answers_to_interview_questions_for_supervisor.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 5748 bytes
SHA-256: cc6e0993bc416063d297430dfd71a4a6d9748be7688028204492cf24eec23b92
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 11408 bytes
SHA-256: 7b223c389fd1ea5a1dec4f7e75dfdf2c8dc1c01ce9accdeb06b52c7cb89b1bea

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