Malicious PDF — malware analysis report

Static analysis result for SHA-256 111fc04fb3c9b139…

MALICIOUS

PDF

74.7 KB Created: 2021-04-04 11:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0017bd00ca868aa63add59119a02e7ba SHA-1: c347b5fcf9f021717a50a0394fbf62caf732adb5 SHA-256: 111fc04fb3c9b139dfc860a69f56d11b67588dcddc13b8e4bd719d29a0b8e781
136 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it's a phishing lure, specifically using an image to redirect users to a malicious URL. The embedded URL, https://midufefew.ru/strik?utm_term=why+is+my+zebra+printer+printing+sideways, is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=why+is+my+zebra+printer+printing+sideways PDF link annotation
    • https://cdn.sqhk.co/xonipavu/hjuBgjc/tiloxuli.pdfIn PDF document text
    • https://cdn.sqhk.co/pupumukisev/YWha4J2/wevogad.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/bibuvuw.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/7dN5hfj/labyrinthine_meaning_synonym.pdfIn PDF document text
    • http://hookup666.site/biology_research_proposal_samplehghud.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/85525429396.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/1jehjeW/management_skills_resume_template.pdfIn PDF document text
    • http://siankaanmexico.com/jesolapozi1wyk9.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/ihKjggg/zegotatenedixowowiwu.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/zupenafud/91420595089.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/19549810504.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/47715197741.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/merubah_file_ke_jpg_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/ti_83_graphing_calculator_emulator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/90102385148.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/dawakedu.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/51817862965.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/how_to_clean_espresso_machine_krups.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/aws_elastic_beanstalk_cloudformation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/literary_review_submission_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/sprint_retrospective_meeting_minutes_template.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/motozewulifupejejogedif.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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 5416 bytes
SHA-256: d2a205cf9e12346140bb96fe9156e3e0f2de8e1a8485f3a980dae8e112c7d07c
font_01_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 10112 bytes
SHA-256: 1229247da22774a261b1fd7a9362611fa077c6d0ce95221b16bce64e0a216734
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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