Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46aba8e23f7312c…

MALICIOUS

PDF

78.1 KB Created: 2021-04-29 03:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ac217409b106ff2154a2a197b7ba3286 SHA-1: 728993e3e2699d35b102cfe87e260627972922d2 SHA-256: c46aba8e23f7312c1c68abb3640980085e11b20553215e0489db09db71e63656
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, further supporting a malicious intent to redirect users.

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://zajinet.ru/strik?utm_term=how+often+to+change+oil+in+honda+civic+2018 PDF link annotation
    • https://cdn.sqhk.co/kufiremikaf/mibjcig/wudofori.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/sitizodekedelelomux.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/jhifiaT/shark_shooting_in_the_season.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/nixesawaranagu.pdfIn PDF document text
    • http://nizumewuminal.iblogger.org/23972781291.pdfIn PDF document text
    • http://lidogikezedeba.iblogger.org/dd_iced_coffee_nutrition.pdfIn PDF document text
    • https://cdn.sqhk.co/molewekane/pTuAjef/tidovegezu.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/kufazete/27179635053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d17d36-0c60-460b-9649-a798a4f191ee/dufunidikutazozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b49131-5d35-45be-97e1-3f428f8d6809/garmin_62sc_for_sale.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_7434bc36eac3489d9d895b45b7646c9c.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_d6ef34e4bb8b4e0590ba446ce94f976c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff778c61-81e3-4da1-9207-10c43e8755a1/50820034025.pdfIn PDF document text
    • https://ff8eac81-0dee-4da4-b7c1-1dee070544a7.filesusr.com/ugd/2637cf_1f9ac9ff50ef46b09f48f3299cd669c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/coping_with_grief_and_loss_worksheets.pdfIn PDF document text
    • http://tizepadeda.rf.gd/zozarofomemusowu.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_2fb9beba51cb4bd19a5e7eca380a14ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ea631f-c20e-4942-9437-ea3c8db0a85d/21774690383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc3a382-c63a-4c27-8cc9-2f533224db80/bizejonekufana.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_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 5640 bytes
SHA-256: 389e63ed84200393e069ce10ab0c54e0fc7c5592b1512a1d7e429bb25f33957f
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 10816 bytes
SHA-256: 04c14d0b88dcc877519e31c13a6a07dc8fe23ff09ec869079734c164feea278f

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