Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d651366b968d3f…

MALICIOUS

PDF

98.3 KB Created: 2021-03-14 15:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe0b7818a8cea9c842755aef0cbb40f SHA-1: 7d7c954b16815c8fd0e3740c70e7f6bf6f3adcef SHA-256: 50d651366b968d3fcd845a9f73ef4afe91bd13c0f21a196fbff7021154d1cc7e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs, such as 'https://kuzutuzo.ru/award?keyword=bragg+s+law+notes+pdf' and 'http://xurekurise.iblogger.org/rajixazufadojutamanes.pdf', are likely part of this distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=bragg+s+law+notes+pdf
    • http://xurekurise.iblogger.org/rajixazufadojutamanes.pdf
    • https://static.s123-cdn-static.com/uploads/4490121/normal_5fff43132ac82.pdf
    • https://cdn-cms.f-static.net/uploads/4443804/normal_6049be03a57a5.pdf
    • https://cdn.sqhk.co/pasivuzuke/iPsjgha/43203442003.pdf
    • https://cdn.sqhk.co/dasofuduveje/oihGAEs/4908085576.pdf
    • https://static.s123-cdn-static.com/uploads/4416792/normal_6008769a8b0a2.pdf
    • https://static.s123-cdn-static.com/uploads/4423462/normal_5fec155e2efdb.pdf
    • https://cdn.sqhk.co/givesaxi/hajcghi/spider_avenger_dash_warning_lights.pdf
    • https://cdn.sqhk.co/pajijolabalu/aic9hav/stick_war_legacy_mod_golden_faction.pdf
    • https://static.s123-cdn-static.com/uploads/4402956/normal_5fd0931adc66d.pdf
    • https://cdn.sqhk.co/kegufamop/SChf7t2/50004316922.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_604d824c4075c.pdf
    • https://cdn-cms.f-static.net/uploads/4392860/normal_6043d0e88dd91.pdf
    • http://vatemuredaxusob.22web.org/our_god_chords_capo_4.pdf
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fe1cf03751dd.pdf
    • https://static.s123-cdn-static.com/uploads/4383295/normal_5fcad4c8e40bb.pdf
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5fff30908a36b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_218ee7ddc32e45c2be2904a0b4943cc4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2718ee51-1a39-4bf0-b6c2-d11a37c41c3e/vietnamese_traditional_folk_dance.pdf
    • http://gupomikalusa.rf.gd/negative_numbers_worksheet_year_7.pdf
    • http://rizinidotedo.rf.gd/dichotomous_key_on_norns_worksheet_answers.pdf
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_3adbff20e3ea47fd8dde71a11044cb82.pdf?index=true
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_38b5fab84588487d8004871193fea15e.pdf?index=true
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_2c76109fa48749a3a86612d91ebd0f0b.pdf?index=true
    • http://lamekukibudinos.epizy.com/48645994945.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_cd9531fa259a4733888ffa40c159f49b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/74bd31f5-30e4-45d7-ad93-8ef37f431326/93879057373.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012773.bin
f4181cb89207d1eb86c0c3025618503e692bbe6c9d8566d298309549d9ec8907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12773 5348 bytes
font_01_sfnt_off000139c8.bin
b093ddb7ee470465967f2fefe2fbdad8d6105bc60b288ab6c2696577d9f85001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139C8 12948 bytes
font_02_sfnt_off00016598.bin
1a19013ca45731d7163c65b77a3b6fefceeacaa99868408eadaa711dfc14571f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16598 16240 bytes

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