Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce78c8ef93f9ee50…

MALICIOUS

PDF

77.4 KB Created: 2021-04-16 16:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d0f0205c8e4982e4d272069b05e87719 SHA-1: f186d8278e6858a27204f9640186fa932e703ea5 SHA-256: ce78c8ef93f9ee50c9174c3fccbfda00e33d5b70708761107a1adf07b74b8fe8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, forming a link farm hosted on disposable domains, which is a common tactic for phishing or distributing further malware. The embedded URL `https://druttle.ru/strik?utm_term=what+sign+born+today` is particularly suspicious due to its structure and the `utm_term` parameter, suggesting a tracking or redirection mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=what+sign+born+today PDF link annotation
    • https://tugupititu.weebly.com/uploads/1/3/4/8/134887320/kavodu.pdfIn PDF document text
    • https://dovowufola.weebly.com/uploads/1/3/4/4/134438787/doburidemulala_dovapogilup.pdfIn PDF document text
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/vabixiwuj_pajokerapalinit_kisolamexusox_siwig.pdfIn PDF document text
    • https://posoxunek.weebly.com/uploads/1/3/4/4/134460252/wopusu.pdfIn PDF document text
    • https://jugujepatuw.weebly.com/uploads/1/3/4/9/134900825/6bc3666b6013.pdfIn PDF document text
    • https://joworuzofoluj.weebly.com/uploads/1/3/2/6/132683209/mubulunoziluk.pdfIn PDF document text
    • https://roxogarafuxor.weebly.com/uploads/1/3/1/1/131164132/2176643.pdfIn PDF document text
    • https://bilopoxowug.weebly.com/uploads/1/3/4/4/134439404/xepozokuguselidu.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/zazobunaxil.pdfIn PDF document text
    • https://vagenovujod.weebly.com/uploads/1/3/1/3/131398358/sodujupo.pdfIn PDF document text
    • https://bofazereb.weebly.com/uploads/1/3/4/6/134675062/3467306.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_63116de021fc4782aaf13b1177a63e58.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_12d14ad014bc487cbab996fefaab7f73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/nike_air_force_1_white_low_top_womens.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_5ad893e32e3143f39597654f287708bd.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_fb2dc1b4624346abbb4f42f9db65d2f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/did_jonah_hill_improvise_slam_poetry.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/18101540261.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_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 4980 bytes
SHA-256: 112aa63375a337991464c691f4d2344450ba9cb5b2a6d98e9a4fc876ecda3109
font_01_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 11336 bytes
SHA-256: 2b0f0db0a4ee0bb28fe260d9613e27c6d8f9b15a8b0721b3e003472bb4e1895e
font_02_sfnt_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3