Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e7fa340c837a7f…

MALICIOUS

PDF

84.7 KB Created: 2021-05-18 09:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 776afc2174f2b0c63bcd11deed232c60 SHA-1: dcf70fb74c9f62e3d456c3d982c9a0a9a90481f4 SHA-256: 05e7fa340c837a7fdef1f6533d1ffbabf8ab11055f374d6043fb0f0c79933cba
184 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, includes text related to downloading a computer book, which serves as a lure. The presence of multiple embedded URLs and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=yuva+upanishad+computer+book+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_60451f11559a6.pdfIn PDF document text
    • https://dibozavo.weebly.com/uploads/1/3/4/5/134501923/130f8d2d17e766.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/a0fd371dc2faa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_606bc21169a88.pdfIn PDF document text
    • https://dijibuxanizaxi.weebly.com/uploads/1/3/4/8/134859775/2858249.pdfIn PDF document text
    • http://tofogabe.iblogger.org/40139926913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_601741378627b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/14062957796.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/43779379469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c60323-e00e-4433-988e-c466071f3930/11427100367.pdfIn PDF document text
    • http://devedejabamox.epizy.com/cap_theorem_nosql.pdfIn PDF document text
    • http://votitagupen.epizy.com/34752488093.pdfIn PDF document text
    • http://lukenulabimoz.rf.gd/how_many_died_in_aberfan_disaster.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/hatchimals_colleggtibles_the_eggventure_game_instruction_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d06bec1-6667-4c79-a734-4e5cfda5a09f/7724706319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e390e8-c2c7-4f98-bac4-f7589b2e898e/risewaponatifakovatev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573db63d-68f1-4f28-9b8b-0276b51e54d1/tying_knots_for_carp_fishing.pdfIn PDF document text
    • http://xonizud.epizy.com/bmvc_2019_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9510386a-81d8-4c7b-a1f2-e0a8705ed0e6/43431270428.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/27839317625.pdfIn PDF document text
    • http://segoxegigo.epizy.com/sheet_metal_coining_force_calculation.pdfIn PDF document text
    • http://jimakobogugiwa.epizy.com/ccna_security_tutorial.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 5712 bytes
SHA-256: 0dd117df65967cc62e612fcd54f75a1519b4196b21283c17d6654551a237a6cd
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 10192 bytes
SHA-256: 38477df52eab4b7a9814784c2f242e683461a4fef2ef2302085e2a3c767c214f
font_02_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 10840 bytes
SHA-256: eb70806a052e0014fa81d0b9a9266484cd6bf75e2cfccd3c4005c928c1605cb2