Malicious PDF — malware analysis report

Static analysis result for SHA-256 888b426886311eb1…

MALICIOUS

PDF

87.4 KB Created: 2021-04-26 02:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 67bb5f2ace930b5243796f56d680064c SHA-1: 1bb291caa5099f56736abbe13b4d638fe87dbeb8 SHA-256: 888b426886311eb17ac8670de56ee04f0dc377d3819843e0373d444d7fa2280d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=algebra+de+baldor+pdf+libro+completo PDF link annotation
    • http://prizinsta.site/free_chat_rooms_to_make_friendsa7ovn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465687/normal_600cb86c6fd86.pdfIn PDF document text
    • http://cmb-societe.com/bitilavipepoxalufubowsitz.pdfIn PDF document text
    • http://tronreserve.online/vanity_fair_outlet_center_reading_pahohmo.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383913/normal_6007d9634ced9.pdfIn PDF document text
    • http://mirror-x.org/rafarupobupezewucvob7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_605a3ee5cbef5.pdfIn PDF document text
    • http://peuly.xyz/kaba_5000_code_changekhgap.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/under_the_dome_season_2_episode_1_free_download.pdfIn PDF document text
    • http://gradstroy.su/case_in_point_complete_case_interview_preparation_8th_editionusd77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5feb60adbee79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_6008247866eee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://panexorumilogim.myartsonline.com/waxobafimokizuz.pdfIn PDF document text
    • http://bikenuzuxidan.epizy.com/which_mcat_prep_books_are_the_best.pdfIn PDF document text
    • http://ludugatitabi.atwebpages.com/pdf_marketing_planning_and_control.pdfIn PDF document text
    • http://pizenusogusu.atwebpages.com/bajijoxosopuwabitasazuto.pdfIn PDF document text
    • http://nesasodatujor.epizy.com/galaxy_s10_plus_live_wallpaper.pdfIn PDF document text
    • http://gajopule.myartsonline.com/42071801745.pdfIn PDF document text
    • http://biliwaxakob.rf.gd/call_for_workshop_proposals_template.pdfIn PDF document text
    • http://jiporeve.epizy.com/dopipobudej.pdfIn PDF document text
    • http://vafikozokus.rf.gd/19527612600.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 5428 bytes
SHA-256: e4ac5438a203d6e1fb5f24dc197ed7447984ba85e8bc4564119e86e6dcfa1883
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 13496 bytes
SHA-256: 76fc1c179f131ab1168d4cb8d212a291727cfa089e952371d7de481c26f9ca09
font_02_sfnt_off00013182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 18892 bytes
SHA-256: ea0e010c6985512a64b5cf543462a196aaa38f120a7cdcea99aadc941084d9e8