Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33c5231b5b3f22a…

MALICIOUS

PDF

79.0 KB Created: 2021-02-21 02:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f10b397c41067ac0ef9e5c925d6bb79b SHA-1: a0862af7eb3f1f658b46ed4bcf6beff54fe1a143 SHA-256: b33c5231b5b3f22a317ecaa4f0a6f99907495173bf7b2955e9c5f5428796e097
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wix?keyword=ucsd+health+holiday+calendar+2020 PDF link annotation
    • https://cdn.sqhk.co/sepunaro/ifbAhhz/22858318591.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/gchbyhf/screen_time_control_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/jdjPndu/free_card_games_no_download_spider_solitaire.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/8hagjji/the_maze_runner_series_review.pdfIn PDF document text
    • https://pafajawu.weebly.com/uploads/1/3/2/6/132682051/gulafiriko.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/haicGA8/world_cup_2014_winner_team.pdfIn PDF document text
    • https://cdn.sqhk.co/jikogifuxa/iJiiOgj/world_of_darkness_slasher.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/ibgDggS/87850000938.pdfIn PDF document text
    • https://cdn.sqhk.co/mafulavet/iligfjd/bevusitubujexowut.pdfIn PDF document text
    • https://bododomeliba.weebly.com/uploads/1/3/1/4/131408614/tajojo.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/qnmk8ij/app_to_gain_followers_and_likes_on_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/idCkkgf/power_supply_circuit_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/zudoputasafe/hdxEyig/befunix.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/luwijavivitiwije.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/iejb4s2/analisis_foda_de_una_escuela_preparatoria.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/VJp3jef/wunopizow.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/cjfjdjf/97250439269.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_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 5396 bytes
SHA-256: c0661748844bdb0255d6e4e50befadf1cc52273d006179383f924ab45546f325
font_01_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 11028 bytes
SHA-256: 5abac68f5bcf3b3fe994a8eee540f9b24b644d8b906897efeaa1e6830591b22e

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