Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0996e73af610571…

MALICIOUS

PDF

129.1 KB Created: 2021-05-15 11:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e059d1631c1d3e7c2e77bb454d58529a SHA-1: 228178d568611b71caf62ddb2ca7a1aac3de850d SHA-256: c0996e73af610571566079045a9c5856fb8aeb77a8712afe850987f873a0a86e
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. It contains a large number of external links, with at least one pointing to a suspicious domain ('midufefew.ru'), suggesting it functions as a link farm or phishing lure. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links and the overall heuristic findings strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=vox+ac15+handwired+60th+anniversary PDF link annotation
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/6863243.pdfIn PDF document text
    • https://rafafusutur.weebly.com/uploads/1/3/4/8/134858683/5443659.pdfIn PDF document text
    • http://goldstein.capital/lord_of_the_flies_summary_chapter_10-12mj6nn.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/89086259123.pdfIn PDF document text
    • http://lozhobelir.space/how_to_understand_physical_sciencelrlzr.pdfIn PDF document text
    • https://nakowubolitek.weebly.com/uploads/1/3/5/3/135349387/nufutexib_jedowab_bedefoneke.pdfIn PDF document text
    • http://lovemecompletely.com/732358529187j7mm.pdfIn PDF document text
    • http://atomyimperial.ru/58075888494ic8wy.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/a6f09f7826a8f.pdfIn PDF document text
    • https://nemotepazifoki.weebly.com/uploads/1/3/0/8/130814284/4504725.pdfIn PDF document text
    • https://webuseki.weebly.com/uploads/1/3/2/8/132814302/titukozonoweg.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/como_hacer_un_plan_de_marketing_digital.pdfIn PDF document text
    • http://alteramaks.world/why_is_my_mac_stuck_on_the_startup_screenlpoxh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_44fc1981ad7d4bb7b7bda7fad4da4c1b.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_11643fc4bb67483899d1a765a7e6301e.pdf?index=trueIn PDF document text
    • http://jatoxat.atwebpages.com/aldi_suisse_prospekt.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_339f199269c540e8a060d4550741010c.pdf?index=trueIn PDF document text
    • http://zaduzos.myartsonline.com/definition_of_business_research.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/41554932539.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/24518762741.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/dell_r710_server_rack_size.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/50562403512.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_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 67440 bytes
SHA-256: bf1dfa00798e6a7662a822381872ee2686853fe61c35ae3340d2604a02d9955f
font_01_sfnt_off0001bde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDE8 5756 bytes
SHA-256: f6ffd201c3d43b6096c1cb4f6da5d58629c89d8f77987df04b788d7150ed4877
font_02_sfnt_off0001d1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1A3 10772 bytes
SHA-256: bb2ffbbb7f0d6ae20f81fe593a3a8e9136a12260b5bc54e06a37b1dc6afe1062