Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dfc31804243d51…

MALICIOUS

PDF

78.3 KB Created: 2021-04-14 20:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41749a6e1e32b943632441b68673991b SHA-1: 9ba524021b2c278bf4948d93de6d0160d180ab54 SHA-256: 21dfc31804243d518d9e7a1c23c221dd4ce70a427f4a08c0d8c15257c8987e6d
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-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://xajibur.ru/strik?utm_term=how+to+run+vif+in+stata PDF link annotation
    • https://cdn.sqhk.co/fopikudapom/cIWuqVu/88881248610.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/hc4hehg/stickman_anger_game.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/8Ubiabf/2640003073.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/jjjfmE3/talking_tom_gold_run_hack_apk_mody.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/jgjiiii/sports_bike_photos_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/dggZUhe/piano_master_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/xatuxazaz/zwje0ji/74114885060.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiferufefu/iBbeHnC/kofafizatakemedag.pdfIn PDF document text
    • https://cdn.sqhk.co/xumefotebe/haIhdgd/alien_shooter_revisited_cheats_pc.pdfIn PDF document text
    • http://dezunanerab.iblogger.org/nutilugamu.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/chgKNhf/66234819664.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_1ccc726d721f466b9a8d879e3bde935f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da878da4-d1b3-4e37-ab8f-1fefa2042fed/penny_stocks_to_buy_in_us_market.pdfIn PDF document text
    • http://masomoxesezog.rf.gd/manual_programacion_arduino_uno.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_4432b9f7d91d46ddaf18dd2870ac9d3a.pdf?index=trueIn PDF document text
    • http://mobevawawe.rf.gd/calendario_anual_2020_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfbecd44-f07d-4f2e-9b9b-25ecc8411cd0/20810818630.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_18bf0350ac084c4d94457015c04d515d.pdf?index=trueIn PDF document text
    • http://demiwadipojaz.epizy.com/92158410109.pdfIn PDF document text
    • http://torifutipu.epizy.com/small_convert_to_ppt.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 4844 bytes
SHA-256: 1897b37ffe50ea029324ca8788eeae6d3fa52936e0182c7d0b9200ca06fd45e5
font_01_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 11544 bytes
SHA-256: 2fdb07735ad281211f6725d81669b3fce212ac49691853487cce44e4972b9fe2

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