Malicious PDF — malware analysis report

Static analysis result for SHA-256 713eb26df72c27ad…

MALICIOUS

PDF

73.9 KB Created: 2021-05-13 03:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5b8952d38b93877bb072aeed4e9fe2a SHA-1: 5289f6e609a2a95aef0b07d1348e1b0bef577f7c SHA-256: 713eb26df72c27adfbc79c741e4bf8d163204d9fc64a1713437bfd53b9698790
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'the cure rules of attraction soundtrack', likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=the+cure+rules+of+attraction+soundtrack
    • http://ipai.online/voluvudosasudumibiw0wck.pdf
    • http://pimamunoper.iblogger.org/mtd_lawn_mower_blade_torque.pdf
    • http://sentytld.online/62910973072fqnif.pdf
    • http://kopusibujivir.iblogger.org/the_thief_of_always_chapter_13.pdf
    • http://esclub.pro/95847990343s3ibj.pdf
    • http://kieverts.xyz/hamlet_full_text_downloaducs0h.pdf
    • http://runexutofo.iblogger.org/blepharospasm_treatment.pdf
    • http://comp-arenda.site/big_bang_theory_cast_missyx8gf2.pdf
    • http://parralax.net/pagusanucjaqp.pdf
    • http://gapejeg.22web.org/how_to_connect_turtle_beach_stealth_700_xbox_to_pc.pdf
    • http://investmag.org/televadanurexayq0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zevuketeno.rf.gd/xozug.pdf
    • https://uploads.strikinglycdn.com/files/5fa3d83d-d19b-47a8-9f66-bb694a54a188/jafiberigusaxarobikaj.pdf
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_4a737f373b384d7091f2902569849736.pdf?index=true
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_b1eaa919f2e6401981cc6e55492ce104.pdf?index=true
    • https://uploads.strikinglycdn.com/files/16bdd865-985e-45ea-938b-faea6d0da678/bejununesamarip.pdf
    • http://zigugimevalevek.epizy.com/56587178545.pdf
    • http://bimuvugibane.rf.gd/salesforce_platform_app_developer_trailhead.pdf
    • http://tananij.rf.gd/arihant_maths_books_download.pdf
    • http://gujalitez.epizy.com/lanek.pdf
    • https://uploads.strikinglycdn.com/files/ae888d37-7a9a-42a2-8498-906bdac1cb2a/how_many_calories_in_a_shredded_chicken_burrito_from_taco_bell.pdf
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_ed65ac93c811402faa5be625ae20427e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2be.bin
5cbea4bc5da0ec3f8cdbb67830fe356dfaecef2a389aa07237e6feec83972c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 5120 bytes
font_01_sfnt_off0000f41e.bin
6caae498dc0d89cb56a2973b05066d0b934303a00c50f9ec8c8762d1aec8ca78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 11168 bytes

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