Malicious PDF — malware analysis report

Static analysis result for SHA-256 925ed10208761384…

MALICIOUS

PDF

80.3 KB Created: 2021-03-12 16:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 093240b23a4c5c134fafab39b80da485 SHA-1: 1e593492c4cd03cc6041112a2774c9a9515d4e3c SHA-256: 925ed102087613844f61eb3337b599cfde8f566ec71720ee3f55483e95164066
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to sheet music, likely intended to disguise the malicious intent of directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/123?utm_term=debussy+sunken+cathedral+sheet+music PDF link annotation
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/pedumutukokozomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_6021be7cbe802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_60178d33c2f42.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/replacement_remote_for_magnavox_dvd_player.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/nokiwidelexemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382617/normal_60026eb30a44e.pdfIn PDF document text
    • https://wixoxane.weebly.com/uploads/1/3/4/7/134734379/841b7127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383321/normal_5fe029ac79a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486548/normal_5fed5e7545097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_6018d7971ca85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_60217e041d4dd.pdfIn PDF document text
    • https://gediwidamavuluv.weebly.com/uploads/1/3/5/3/135348022/sigaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483851/normal_5fcd37f571abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447263/normal_5fc680d8bfe26.pdfIn PDF document text
    • https://jipoditilab.weebly.com/uploads/1/3/1/4/131407274/2134476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_60200b8ce1f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_600b75e928efd.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/pajefubosimuj.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/tazumis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492278/normal_5fff4c5e91d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_5fdaf54a49c35.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/89a65d70-a1e9-4817-b9d4-73230b2f0e6a/97188488103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53be94dc-d65b-4fff-a7e8-576d19d21dcd/how_much_does_planet_fitness_cost_to_cancel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2de90e-d4c4-423f-8456-47e66bddae8f/dream_dictionary_spiders_crawling.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 5484 bytes
SHA-256: 4c94f32a75a5ab2e5a61aec4683cf9af6e23d50bd859eb68edb992fa65bdf501
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 12088 bytes
SHA-256: 8cb54d2a757894748874e3cb29604d05363d9cd8417978fe568f9d1e5562da4f
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 16096 bytes
SHA-256: 2dff1fc3e5bf1049a512ca2ab3d4448021a5e4676c0c9a63fbc3d390c83797d9

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