Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98ef79e236a5397…

MALICIOUS

PDF

76.6 KB Created: 2021-01-18 20:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 22e724a3a6cfc4f5a10eeb2c4bab38e5 SHA-1: b88aae23ecee8105c7674dc2e7395281a11bcfdd SHA-256: b98ef79e236a5397c8b8126322b24104e694c1608ae04a4b415d812a47590fce
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, with one such link pointing to 'https://traffset.ru/123?utm_term=na2so4+massa+molar'. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by presenting a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=na2so4+massa+molar PDF link annotation
    • https://site-1175642.mozfiles.com/files/1175642/xejem.pdfIn PDF document text
    • https://site-1252382.mozfiles.com/files/1252382/25283250279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5fd192d5d3b0d.pdfIn PDF document text
    • https://site-1168528.mozfiles.com/files/1168528/super_ninja_sushi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_5fb7ed37ea609.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/g8ddifl/voice_changer_app_male_to_female_call.pdfIn PDF document text
    • https://site-1179952.mozfiles.com/files/1179952/jerapesigixotijon.pdfIn PDF document text
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/dugowadimuzarutiveni.pdfIn PDF document text
    • https://site-1083549.mozfiles.com/files/1083549/47521475142.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/gs_auto_clicker_3._1.pdfIn PDF document text
    • https://site-1166671.mozfiles.com/files/1166671/velebubewajigekuxi.pdfIn PDF document text
    • https://kotonimurapuva.weebly.com/uploads/1/3/4/4/134440920/sidukigejatufikazoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471948/normal_5fdec5462cedf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fe0d92cb1b33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivopob.epizy.com/alarm_azan_ringtone.pdfIn PDF document text
    • http://jijetebum.epizy.com/centos_6._8_32_bit.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_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 5020 bytes
SHA-256: 4f4f2306b9083e31bede5b3785c380edbdeff9363040e417a29e857045e7f0f1
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 2236 bytes
SHA-256: a5cb4918489952136b44c1aa6dd11d6d1859577cf30f416ccad1b66782247f89
font_02_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 11540 bytes
SHA-256: 85bcd7b12b7321de7d359aaf8f23dc8eac30afd3d8a757b16ffd382d86d34988

Open this report in the interactive analyzer, or submit your own file for analysis.