Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af4f782c0f084fd…

MALICIOUS

PDF

151.0 KB Created: 2021-03-09 10:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a59a62d4148ac86d8f08eaf17478ba7b SHA-1: a549f76ef1695b873d78dcc85237feecdb39d148 SHA-256: 8af4f782c0f084fd171a669a04a35cd0cf9b4ea72c540350458d45efce153e70
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially malicious or low-reputation hosting. The document body, though heavily obfuscated, contains keywords related to 'Taoism holy book pdf' and authoring application details, suggesting a lure to disguise the malicious intent. The presence of external URIs and the link farm structure strongly suggest this PDF is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 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://jacksth.ru/award?keyword=taoism+holy+book+pdf PDF link annotation
    • http://zamowafa.mywebcommunity.org/shaded_cream_miniature_dachshund_for_sale.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/pakistan_studies_2nd_year_key_book_in_urdu_mcqs.pdfIn PDF document text
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/11c82f81c76e0.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/povibowasab-jakozadujejujow-xulebug.pdfIn PDF document text
    • https://xibemorebag.weebly.com/uploads/1/3/4/3/134355918/870343.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/6562844.pdfIn PDF document text
    • https://didoruzokikad.weebly.com/uploads/1/3/0/7/130739542/tonasijobo_pozus_vavejotutefav_ruveji.pdfIn PDF document text
    • https://giwakatunu.weebly.com/uploads/1/3/1/4/131437107/85afb.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/4708314.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/wolufivojifog.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/6616416.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/zixikiketafuwuw.pdfIn PDF document text
    • https://wikumegi.weebly.com/uploads/1/3/1/4/131407968/tofaf.pdfIn PDF document text
    • https://sonetevarepe.weebly.com/uploads/1/3/4/8/134851601/fc342655b18.pdfIn PDF document text
    • https://mipigonegomef.weebly.com/uploads/1/3/0/8/130813466/nifumo_wixusitokek.pdfIn PDF document text
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/fozulabumawe_nefixa_kunap_wagavubu.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/c7f02d11-4d4a-4442-ae5d-17d420041f73/59363371586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb4bf83-1ff9-42d2-9f83-f3d1acd14fd8/kokuzoxoxinetopajiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4803a80a-5d69-4f5f-b89f-5c3535ab44c5/sovigasufurerubopur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba0dec7-4cdb-4956-9f98-1063fde80f56/divine_mercy_catholic_church_north_courtenay_parkway_merritt_island_fl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b2e174-1332-4cdd-86d8-d44186db70be/jizozupobozit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3048c6-71f9-4ded-b8bd-4223b50a8f4f/best_crossfit_exercises_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0190a4a-d4cf-4a5e-ad76-6608004ca911/realistic_vs_unrealistic_goals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9813f19-460f-4f20-90f8-79f15e7f0912/63276715492.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8EF 19604 bytes
SHA-256: f67ae126a5f4bb5c3212bee972d414991400a646379864408904ab438818aaeb
font_01_sfnt_off0001f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F76F 4924 bytes
SHA-256: 34c448fd287fafeda629d8724177df0c551ed71cd7708a2a7e06783a617ec0b9
font_02_sfnt_off00020827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20827 19244 bytes
SHA-256: 3e6323cd683e8d9f25f131ec03f13d96fea43b2d377d86f8aeccbda20a165a47
font_03_sfnt_off00023f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F30 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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