Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4fa8b557521745…

MALICIOUS

PDF

79.5 KB Created: 2021-03-14 16:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f5f07232210388ce2b9c033340c93b23 SHA-1: 972a2e643d6cae85544c5d7c5a3568df363c1262 SHA-256: 1b4fa8b557521745da976d6101cda0c18d09153a60c529e49131d0143f5d579e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/wix?keyword=big+brother+albania+10 PDF link annotation
    • https://cdn.sqhk.co/wifopuzuxiba/giFjchb/7_words_of_jesus_on_the_cross_video.pdfIn PDF document text
    • https://cdn.sqhk.co/figotabam/hhijPgc/2_player_games_tug_the_table_unblocked.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/81469935759.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/yhakhij/word_with_friends_online_login.pdfIn PDF document text
    • https://cdn.sqhk.co/sewizefaxiki/ig25Djh/motorcycle_stunt_school_california.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/QCjgrjh/fps_robot_shooting_strike_counter_terrorist_game_2019.pdfIn PDF document text
    • http://sepozimog.scienceontheweb.net/cannery_row_chapter_13_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/2heKEia/fijemax.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/1bc445d635b20.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/ihjjiga/boxuzogorabimizodipuji.pdfIn PDF document text
    • https://xivanolub.weebly.com/uploads/1/3/1/3/131380121/vasukedozixofo.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/fevamewixoligu.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/nedijowewoded/80228785.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/template_arlina_design_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/28910210837.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/celebrity_quiz_answers_level_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24921fdd-6ac2-4da0-96c0-0f216ef647b8/burafetezokigarem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6bf6a9-6b58-43aa-a27e-e0559a210d78/pejelivisaluwutipalumoz.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/jozipibefavikubi.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_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 5152 bytes
SHA-256: 2550c10d6d93871c24845c985c0b29a877fb8a499a63430e77337d0cf87ce904
font_01_sfnt_off00010ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 11520 bytes
SHA-256: c08b1c15e78c97f631bb6de88ee359d105d52d9f63d762198ab8e782ab503aa1

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