Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbd1aa4b988cfa4…

MALICIOUS

PDF

86.9 KB Created: 2021-05-11 06:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cb1494d539d31d60b62f4771e69ced9f SHA-1: ffb38b50204ca196b452f1f3c389d768536f1c84 SHA-256: 7dbd1aa4b988cfa419609f09adf4b99f700d55490df1fc7da725d14df54b9d57
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://vilenefex.ru/strik?utm_term=48+metro+bus+route+los+angeles PDF link annotation
    • http://kojibataruv.iblogger.org/depufivumejigon.pdfIn PDF document text
    • http://hdsamara.ru/forklift_operator_training_center_near_me0u0r8.pdfIn PDF document text
    • http://kismykeitio.best/mini_zombie_takis_caloriest6l4r.pdfIn PDF document text
    • http://car-test.pro/tapoziwilajudomitikotoguwd9md.pdfIn PDF document text
    • http://jegewuzewan.iblogger.org/tifazetipitebufibexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_60170e7ddd36c.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/70158662905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481400/normal_5fd9d71385f3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_6012fcbfbc1af.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/el_hobbit_2_ver_online_espaol_latino.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://uploads.strikinglycdn.com/files/2ddb7edb-e47b-4dfc-b9b8-a8592b755e00/14889634614.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/370261350.pdfIn PDF document text
    • http://kimirukuku.epizy.com/school_education_quality_index_2020.pdfIn PDF document text
    • http://kodosalepixalan.epizy.com/zulagelubunanuzafugun.pdfIn PDF document text
    • http://nobegik.rf.gd/27990942354.pdfIn PDF document text
    • http://kezijewuzal.epizy.com/what_are_the_national_teaching_standards.pdfIn PDF document text
    • http://biragexakulutaj.rf.gd/nuruzoxulujowibet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177b4801-5686-4dc9-954b-12d0ab356311/sinobafo.pdfIn PDF document text
    • http://kirerena.rf.gd/vinaporixejisew.pdfIn PDF document text
    • http://kiduxoz.epizy.com/review_of_the_outsider_by_albert_camus.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_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 5168 bytes
SHA-256: dfb1224ae6b3d71b77e0e6e89be0b47ed3e9267d5407d79548a154282bf219af
font_01_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 10712 bytes
SHA-256: 7fc72de6abddeeaa4dc9d2f0190f85514a25bec08e67f99c2b698bb54c32c216
font_02_sfnt_off00014028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14028 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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