Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc7298a0c403621…

MALICIOUS

PDF

72.0 KB Created: 2021-02-22 06:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9fffc7e87e449a36102b10f6b6495ec9 SHA-1: 3497fe17e5906e2e8cf374ad15ae45181b0d2129 SHA-256: 7bc7298a0c40362129a1ad5b40bce9e9ba105dd21f2defbdc86e0d3a9be97a77
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://seumenha.ru/aws?utm_term=world+history+quiz+questions+and+answers PDF link annotation
    • http://dokusamatofapig.iblogger.org/kepiwifufokiderimedonevi.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/xabomazavito.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/Ndjeu09/boom_boom_football_cheats.pdfIn PDF document text
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/donakuxinuvew.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/dtpBEI5/tizusedunotoxuwiwugadize.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/gdhDhOb/my_ballroom_events_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/zamepeja/Yjjiajf/8392594831.pdfIn PDF document text
    • https://cdn.sqhk.co/zaxuloxedu/gfVifA5/part_time_occupational_therapy_assistant_jobs_near_me.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/fuporetalegupumo.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/I9Dyoig/good_offline_pc_games_2020.pdfIn PDF document text
    • https://vojawozusuv.weebly.com/uploads/1/3/1/1/131164351/be7dc0f8.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/zobabafewugedukimagu.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
    • http://woxutonugosafer.epizy.com/61154404730.pdfIn PDF document text
    • http://joluromimazatub.epizy.com/64632743959.pdfIn PDF document text
    • http://werolalijatet.rf.gd/vatogekapixed.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_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 5176 bytes
SHA-256: 0af0570bd836cf815d04964c631ec59fbb2b2255ded8b3c48c845e426e340e67
font_01_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 10344 bytes
SHA-256: eff45c7ec8717416f259a17fed7c94d7555ddfb09e48210cad203f97b7b8051f
font_02_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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