Malicious PDF — malware analysis report

Static analysis result for SHA-256 582f12ce226351b5…

MALICIOUS

PDF

82.7 KB Created: 2021-02-25 02:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cdb9019f72b820b5288107577dc25598 SHA-1: ffd51f06a1c43f7812fa0c66f0f5f1759e198a0f SHA-256: 582f12ce226351b5aa487f2df74115eeffcaa529b1d469e7c6bb4109f22196cd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it's a link farm on disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The embedded URL points to a domain that appears to be part of a phishing lure related to 'Jlab wireless headphones review'. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=jlab+wireless+headphones+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5ff619967e014.pdfIn PDF document text
    • http://tunapobene.22web.org/34615010124.pdfIn PDF document text
    • http://rajedat.iblogger.org/bash_cheat_sheet_mac.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/physics_class_12_punjab_textbook_board.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/43411230416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_601de36ce0acd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490738/normal_5feb6172dc509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_6000ef8551481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_601e540a99e07.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/nagutovidurezuxe.pdfIn PDF document text
    • http://wonujabazuvopa.22web.org/how_much_does_a_criminal_lawyer_make_a_week.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366987/normal_600564c826b52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tazopaju/sample_employment_verification_letter.pdfIn PDF document text
    • http://jezesukawug.rf.gd/synopsys_design_compiler_installation_guide.pdfIn PDF document text
    • http://sudonek.epizy.com/bible_in_easy_english_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/shadow_health_running_slow.pdfIn PDF document text
    • http://totofexux.epizy.com/kixiwulemukosatiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/graduation_certificate_template_word_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/classifying_chemical_reactions_worksheet_carson-_dellosa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 5328 bytes
SHA-256: a87a40d7b143675db8c3ad83caafe43d7e87783fdeaee28b1f173693754688bc
font_01_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 10252 bytes
SHA-256: 8d3accf240d1dc8249fadaed0960f98801d8602b38ba7e141c65a5f8ac0270fe

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