Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db05b0747af9c36…

MALICIOUS

PDF

112.5 KB Created: 2021-03-17 07:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc6e0ae13376f0887ebd8a2e27f0cbcb SHA-1: 51519e0d2ff471b2966e2d6b5c295651145b8ed9 SHA-256: 4db05b0747af9c360f96823f8de0fed55b1fad774852bc06f2922be1a975db1e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and the primary URL 'https://jumiwimov.ru/wix?keyword=everfi+credit+scores+final+quiz+answer+key' suggests a lure related to financial information. While no scripts were explicitly extracted, the presence of external links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=everfi+credit+scores+final+quiz+answer+key
    • https://cdn.sqhk.co/tazurusubiz/id5ifDI/microgolfoven_kopen_mediamarkt.pdf
    • http://fresh-ita.space/15973336122p6q7u.pdf
    • http://taforojujutusig.mygamesonline.org/70957407662.pdf
    • http://help-business-media.com/jirupanoj8oikx.pdf
    • http://fullcreditreport.info/fisobumubeworevugosawuwed6a.pdf
    • https://bogigevaruzo.weebly.com/uploads/1/3/4/4/134435623/3070347.pdf
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/6760807.pdf
    • https://cdn.sqhk.co/vinasujitupe/dliiiAR/zimaluwetebirisadiviripil.pdf
    • https://cdn.sqhk.co/gewewoturila/dzkz7ha/sunday_school_lessons_for_adults_topics.pdf
    • http://ses-paypal.com/katufojaroriragekitavev741x1.pdf
    • https://cdn.sqhk.co/gusisitixinu/i0ibUeB/wordpress_plugins_not_working.pdf
    • https://tolutewegudef.weebly.com/uploads/1/3/4/0/134097468/2119859.pdf
    • https://cdn.sqhk.co/tororukiwuri/CieGehg/emergency_alarms_for_elderly.pdf
    • https://povisegidugukab.weebly.com/uploads/1/3/1/8/131871963/1101887.pdf
    • https://cdn.sqhk.co/niserutom/jfXDYhc/xaparuzumugexazewa.pdf
    • http://seomagnat1.online/22688013643y2z3e.pdf
    • http://tulomodev.getenjoyment.net/maximized_manhood_book.pdf
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/8605988fff523c6.pdf
    • https://cdn.sqhk.co/mivijigonof/Aif2wME/mosadopukominejew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d22d9bb-52c2-4230-ba4a-53f843e90639/58836662924.pdf
    • https://uploads.strikinglycdn.com/files/5f503849-2a79-4b63-8d5f-459fc45f90bc/early_transition_metals_properties.pdf
    • https://uploads.strikinglycdn.com/files/0c2a7f1f-5080-4f21-b1aa-83dbd2c35b60/graco_duet_swing_replacement_cover.pdf
    • http://mawokale.myartsonline.com/onn_alarm_clock.pdf
    • http://sojufuka.atwebpages.com/21717310659.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a12.bin
0c9d2ebe0075d5c7ffb7d7ba4eaccb5d6ac9d6ccc4588e445d93fb3499322114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A12 5464 bytes
font_01_sfnt_off00018ce4.bin
7c876b52f78435250b5f338fe9f03cb31d9fc758d4643c81ad5a41ff8492d9a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE4 11536 bytes

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