Malicious PDF — malware analysis report

Static analysis result for SHA-256 879c52c2a6a0ba9d…

MALICIOUS

PDF

76.0 KB Created: 2021-03-30 07:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2235d48903c4dfb37e8367a437f3a40a SHA-1: bf56daf5df7e3102cd09e88208de0978fc8efdcb SHA-256: 879c52c2a6a0ba9dbdf2c1d39a0a7f9e234e455943662eddb8d417c91d2c1c0c
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL `https://lozipotod.ru/strik?utm_term=blade+inductrix+200+manual` is the primary indicator of a malicious redirection attempt.

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://lozipotod.ru/strik?utm_term=blade+inductrix+200+manual
    • https://static.s123-cdn-static.com/uploads/4477386/normal_5ff1c0abec89f.pdf
    • http://nikopexuvedafes.iblogger.org/wolelanozavuxupi.pdf
    • http://lusolakidareve.mywebcommunity.org/how_much_is_a_used_yamaha_baby_grand_piano_worth.pdf
    • https://static.s123-cdn-static.com/uploads/4484624/normal_600304a1e4385.pdf
    • http://lejunuzegakikuv.mypressonline.com/78717777141.pdf
    • http://dafagaketa.sportsontheweb.net/jubusosukoxetimifedefis.pdf
    • https://cdn-cms.f-static.net/uploads/4426059/normal_5fe8b7961a6db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rewepalazamiso/asus_rt-ax88u_router_login.pdf
    • https://s3.amazonaws.com/megodipewukitoj/guiding_light_foy_vance_sheet_music.pdf
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_c1bf768386ff466499f2fc8f1e51252a.pdf?index=true
    • http://jajabadexorulab.rf.gd/42118258793.pdf
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_20a07b8f220f4590a4e8060b3e15cfde.pdf?index=true
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_6996ca5834f14d9882decbf1bf199000.pdf?index=true
    • http://bexovivuvere.myartsonline.com/zuzerusami.pdf
    • https://s3.amazonaws.com/natewared/zosobadude.pdf
    • http://wifekukoxigax.epizy.com/senak.pdf
    • https://s3.amazonaws.com/kobivimelelo/kivufebibobozoge.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_4eff83cd8c3d4d859cfdbaa7fb27f3ae.pdf?index=true
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_84888509fc944717a70c3f463d1bd98a.pdf?index=true
    • http://wujagenak.atwebpages.com/convert_multiple_jpg_to_online_small_size.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_off0000e8be.bin
a03f5410dbe16f1beb4f8237144ee2118d91360fc5108931d4345b90cabfd2d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 5296 bytes
font_01_sfnt_off0000fab1.bin
ae05ea47a3c26e1705451827923e3af84064d2527eabfec6773e6193033f57a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 11652 bytes