Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c7d17797732f17…

MALICIOUS

PDF

73.9 KB Created: 2021-02-27 08:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a564017914b6f30dee993f7b54973397 SHA-1: 202e937d17e6138c6e0880c500b133fcdc92a621 SHA-256: 65c7d17797732f17d05783bafe6d7fca4943bee6a02ef3ddfee6f4ee8eaf7748
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with several pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=air+force+reserve+officer+pay PDF link annotation
    • https://mizabago.weebly.com/uploads/1/3/5/2/135299272/rudivu_jolixepi.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/d3jdsJF/19336085165.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/3Iic4hd/nba_2k20_myteam_gameplay_tips.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/1380718.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/enWjahg/parks_chevrolet_charlotte_staff.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/Wgfheih/zombie_invasion_minecraft.pdfIn PDF document text
    • http://kibukulatari.22web.org/73014227323.pdfIn PDF document text
    • http://sk-anker.ru/formaat_handbagage_ryanair_20195qq1h.pdfIn PDF document text
    • https://jugujepatuw.weebly.com/uploads/1/3/4/9/134900825/zipazuker.pdfIn PDF document text
    • http://ponaleke.iblogger.org/kisosafotodawivuge.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/2972849.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/wiwuxot/70930683396.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/iba_mba_admission_test_preparation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/98214633512.pdfIn PDF document text
    • http://pibanifadedo.epizy.com/short_reading_comprehension_worksheets_5th_grade.pdfIn PDF document text
    • http://zazedosipafefu.epizy.com/adobe_photoshop_cc_2018_free_softonic.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_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 5128 bytes
SHA-256: 805af28456646760b347b1fc9dadc9c1e80b6a72d21e9ed3113f06bb45d24809
font_01_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 10884 bytes
SHA-256: dce903b79203eebd28deef0f30530e616a88233ba8fd4d3aff1178bbe59a083e

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