Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e4afba5c433eaa…

MALICIOUS

PDF

78.7 KB Created: 2021-04-16 10:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e655cde0a9fa57b2daaa2293de73b581 SHA-1: ccdb57af703298e76526a51ae38d50d1caefc10d SHA-256: e2e4afba5c433eaa2be385690610a5513e9afe4f81e7910f2076ef84de84a141
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting and acting as a link farm. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=old+kenmore+sewing+machine+e-6354, which is likely used for phishing or to serve further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=old+kenmore+sewing+machine+e-6354 PDF link annotation
    • http://gubixazolela.sportsontheweb.net/98995038359.pdfIn PDF document text
    • http://srakan.space/rimworld_error_loglrlci.pdfIn PDF document text
    • https://cdn.sqhk.co/juxajomuz/F5RqjeV/64066476852.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/zjeahey/rijelibopasawogaguzavuxuz.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/27623227470.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/how_did_positive_psychology_start.pdfIn PDF document text
    • http://bupro.asia/akhisarspor_krmz_formabi807.pdfIn PDF document text
    • https://cdn.sqhk.co/javufikari/Zhhhecc/16337704134.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/idiaaie/parkour_runner_unblocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/buduxetulatevamedar.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/botaxozijerina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e35b66-3c8c-41ce-ad03-281e0bbc046c/does_algebra_2_have_an_eoc_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e7300f-dee4-4504-8bcc-3ba8e497eaa7/31861225797.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/29111930058.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/abstract_nouns_worksheets_for_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34890ce5-bbac-40c3-934b-ad18dac8198c/pebiker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea9ca5b-c94a-4642-a8f7-82131ed1485f/hp_laserjet_4200_maintenance_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37c4ba6-c4bf-400e-82ea-3cfc8872de75/how_music_works_david_byrne_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/ap_literary_terms_and_examples.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_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 5804 bytes
SHA-256: a99f9953224039dece5d75f98c1e47d35e28daa1d5d9defe4b4afcd27d26b92d
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10512 bytes
SHA-256: c296c3290928f4ee68a9f0c370b1156af5a957691221d7eae9caf093609ab4d6
font_02_sfnt_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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