Malicious PDF — malware analysis report

Static analysis result for SHA-256 a196be44726ff920…

MALICIOUS

PDF

69.0 KB Created: 2021-04-03 09:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4251d6e7478738972ff727c3b961db38 SHA-1: ea2cfb0dcb620ed81f977d66cbca579e81a0f425 SHA-256: a196be44726ff92010b28c7713565ffefabd453cf6d55f1fedb63c40b7ff5d97
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to educational content, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://botokaw.ru/123?utm_term=volume+of+prisms+and+cylinders+practice+worksheet PDF link annotation
    • https://cdn.sqhk.co/patagarinixa/j4iaHGD/2139678886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481161/normal_5fe373ef5f593.pdfIn PDF document text
    • http://pogadai.xyz/how_to_cancel_call_forwarding_on_landlineizld4.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/idZhejg/sigesenilejegom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_60102ef674adb.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/jhagfHM/best_smash_burger_melbourne.pdfIn PDF document text
    • http://znakomstva18x.site/gavopixeganupivafijdi7gl.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/pidVCij/uncharted_tides_port_royale_full_apk.pdfIn PDF document text
    • http://malespw.xyz/farmville_2_bonus_collector_free2dnf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_6055b2e353171.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/hjjfIVY/crack_shooter_mod_apk.pdfIn PDF document text
    • http://storezone.info/tafabikoznle8g.pdfIn PDF document text
    • http://topcreditcheck.info/57444562158siwvy.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/ezhjggj/transformers_robots_in_disguise_2001_complete_series_dvd.pdfIn PDF document text
    • http://gtomishebs.xyz/51050524159v88ya.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/80150c0f-bf69-4fd9-97bf-13abe47c9ecd/14956645477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a95984-d3ba-41ea-8a76-2a12db55c9ee/coleman_northstar_dual_fuel_lantern_mantle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f0b5c1-ffed-4418-928a-870eb7fc565b/american_bases_in_germany.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03debd5-a114-416c-84c1-50fd21c96005/juwuwinofazeb.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_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 5616 bytes
SHA-256: 47c0b3c9ad6c634f2bb945cc17c9f9f31eb4eaf1e6f15a19b8b119615cbfad67
font_01_sfnt_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 9976 bytes
SHA-256: 1ee61de94c4c68327cf5b9196dbe5eb6ee6c0503f88897405476ef0960b0e5f9

Open this report in the interactive analyzer, or submit your own file for analysis.