Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad245c2786e3882…

MALICIOUS

PDF

85.2 KB Created: 2021-04-15 10:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a82e0fe0b403dda741717ef5f32400b SHA-1: 962c3f4ab2b2e175e8789f8d0e24742d6396ce77 SHA-256: 8ad245c2786e3882cd841e45a3e4f0aae0cb0127d82dfd97a1651a3fe8425270
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. One of the embedded URLs, https://seumenha.ru/strik, appears to be part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=cortisone+injection+knee+cost+australia
    • http://jaxifas.getenjoyment.net/wexexopemonar.pdf
    • http://palipupo.22web.org/xikonenu.pdf
    • http://mobufuwiwid.medianewsonline.com/pofogov.pdf
    • https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/puben-zodumi-nezuxepuposa-vulixodon.pdf
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/3641885.pdf
    • https://kilexudu.weebly.com/uploads/1/3/5/3/135347894/3838018.pdf
    • http://tixesikixux.mygamesonline.org/58632988549.pdf
    • http://bamirajewenexo.medianewsonline.com/crochet_stitch_chart_printable.pdf
    • http://xuxikurov.mygamesonline.org/arthritis_back_exercises.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tukurazetuxud.epizy.com/gisugebevitetiwiwad.pdf
    • https://s3.amazonaws.com/suxuzubojut/how_to_reset_pioneer_radio_divx.pdf
    • https://s3.amazonaws.com/lepefi/saselubo.pdf
    • http://topufopotu.epizy.com/36479595341.pdf
    • http://besafetusupug.atwebpages.com/44_phonics_sounds_chart.pdf
    • https://s3.amazonaws.com/wajibile/sheet_metal_gauge_chart_stainless.pdf
    • http://pabotojixupi.atwebpages.com/un_behindertenrechtskonvention.pdf
    • https://s3.amazonaws.com/novipaliwid/android_compatible_car_stereo_single_din.pdf
    • http://baletax.onlinewebshop.net/asymmetric_aldol_reaction.pdf
    • http://zivikabazixo.epizy.com/crazepony_mini_camera_sq11_manual.pdf
    • https://s3.amazonaws.com/piwupevivotixi/candlestick_charting_explained.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cb0.bin
0e6ecd6fe759affdd2e137368de82bd0bcdc8a50823189ba2ac4ccc1625f6ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 4840 bytes
font_01_sfnt_off00011d37.bin
ea1cdb982b190afd7d3558d1aa3224624c035acfcc22ae13d634106edcdb2272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 12244 bytes

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