Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf7b401da94be06…

MALICIOUS

PDF

77.6 KB Created: 2021-05-13 05:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 60b905f4217ca85ecf06b1ebba154e1b SHA-1: 119a8bcab57c6f98ac90ccc0e94b29f54247a37d SHA-256: ccf7b401da94be060e50ec4192fdcf1e8ead58f64048597d2f07b2d60fbb2882
226 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to lead users to malicious content or phishing pages. The presence of a password-protected archive lure indicates an attempt to bypass security scanning by encrypting the actual payload. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=d%2526d+scholar+characteristics PDF link annotation
    • https://cdn.sqhk.co/guzowozuk/s6ibhdr/deretisidakudajorarib.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/XtD28gc/download_game_real_skate_3d_mod_apk.pdfIn PDF document text
    • https://sijotifibiga.weebly.com/uploads/1/3/0/9/130969940/72f1fd7fe.pdfIn PDF document text
    • http://nelilovodik.scienceontheweb.net/79781386668.pdfIn PDF document text
    • https://dawukobisoxewi.weebly.com/uploads/1/3/4/0/134040495/xafonodiraxux-vogizufiberis.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/xevobazuxetekoze.pdfIn PDF document text
    • http://table-wait.com/44214647755j9uo7.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/593556.pdfIn PDF document text
    • https://cdn.sqhk.co/pefapalotux/igZihjb/budolaxazugulujad.pdfIn PDF document text
    • http://brosbass.com/watch_the_motorcycle_diaries_online_freehjerm.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/temosedebojurez.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/PjjhcBI/60055166599.pdfIn PDF document text
    • https://mijonuguvozu.weebly.com/uploads/1/3/1/8/131871478/tigopowa-pivavuzomog-sexazosabifuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d1aa346c-9aa0-444b-9dad-a042b3d2d601/lesijuwituzerujodezu.pdfIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_0a5a1127888f4ea187b0ab37ba46a6c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e347212-ac02-4205-a203-fcc429c38926/physical_science_textbook_online_11th_grade.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_a3edc114a13b4d1e831d0607c8e17f4e.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_0ed1e67fd4c847b48973de9b60e4255e.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_3f5cf54f4c6e40afa10f565128423788.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2616e1b-9d62-40ee-b2f3-aa3481cfd4e6/1233013258.pdfIn PDF document text
    • http://xarilupinedup.myartsonline.com/75164162395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac245db-1915-4844-a511-03e20581d6fe/ratikibunipebo.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_e5114a2c3d474c868d481c648e64fe58.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 3484 bytes
SHA-256: 6d180028f71bbfcf2b8105938643ee3a2a1c409b0c980e92ec88398b70d34608
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 10784 bytes
SHA-256: 1a573363baf6c2056a4f9048a63313b85237c720bd3f449bc8f903e184c9f334
font_02_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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