Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e63dc1cf11b0e0…

MALICIOUS

PDF

109.1 KB Created: 2021-04-24 13:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 662a29d66cbf4a3046a5f07ae3039c7c SHA-1: f2db238db9c0d7ed59a5345b587dfac84b9b9136 SHA-256: 06e63dc1cf11b0e0d898c957e2f3aa8a7ae1672525bee367ee7437591d9e0488
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 numerous external URIs, many pointing to disposable hosting, and one specifically uses a UTM term that suggests a lure related to a firearm. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect the user to malicious sites for further compromise.

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://jumiwimov.ru/strik?utm_term=fn+browning+hi+power+mk+3 PDF link annotation
    • http://ergors.space/hiwin_linear_guide_railn3fxz.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/duvane.pdfIn PDF document text
    • http://gradstroy.su/abcd_song_video_freeh6f8g.pdfIn PDF document text
    • http://uber-global.com/best_bible_study_guide_online8ql97.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/violin_chromatic_scale.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/sahih_bukhari_in_urdu_download.pdfIn PDF document text
    • http://grigolia-studio.ru/zepulobirobibojurubifo2g04d.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/popcorn_sheet_music_violin_canon_in_d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a06f04-0d28-4755-a607-3ba3a5804572/kings_quest_7_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/volinev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c04ff6-acd6-4229-92c6-aaaa6531f2ff/badger_500_reset_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/nefuwukegiwagezimetisev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c50985c9-7375-4dea-972e-ad65f52d658c/how_can_you_tell_if_a_vacuum_tube_is_bad.pdfIn PDF document text
    • http://kurerori.myartsonline.com/31070376977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2baaa79e-6ce2-4aed-9595-c9dca9e2e15f/how_to_use_heat_n_bond_hem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecaaf3ad-71d8-47d1-942d-50260963ebb8/toyota_camry_2019_interior_red.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_off00015bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BED 3048 bytes
SHA-256: f24418afde991e348e9fa02a9bcaee3fbd18cde993421a29031e4c00fc50a885
font_01_sfnt_off000166c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166C8 5228 bytes
SHA-256: c751b66accf598715d38144c5bcc177794be34cf5ef99ee83cb11a2f6ee6c57e
font_02_sfnt_off00017889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17889 17528 bytes
SHA-256: 6b62c24333645a6afff269377e5b68ab59d768396281ab1479fd39b05559e76b

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