Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d990758c8afcd1a…

MALICIOUS

PDF

73.6 KB Created: 2021-03-22 23:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ed3fbfda38abb0f239df4f3c247224 SHA-1: d2e2c641dee6f3ad79bc8008b8882665cbeb1a88 SHA-256: 4d990758c8afcd1a780806b775aebb97a6f4250138fa8deff2aba4f2c0f4f2db
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('ponafet.ru') that appears to be part of a link farm designed to redirect users to potentially malicious content. The PDF structure and embedded links suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=how+to+crochet+a+sleeveless+cardigan
    • http://fisareboveda.getenjoyment.net/whirlpool_quiet_partner_ii_lock_light_flashing.pdf
    • https://cdn-cms.f-static.net/uploads/4473638/normal_603154b75cb22.pdf
    • http://gokawojop.scienceontheweb.net/doodle_art_tutorial.pdf
    • http://gimatadokij.mygamesonline.org/gafidoruxotopo.pdf
    • http://lumobumekola.getenjoyment.net/wamolujisebusipewimosi.pdf
    • https://cdn-cms.f-static.net/uploads/4426695/normal_6025060345834.pdf
    • http://kogutojoveso.mywebcommunity.org/bugonubagigikelum.pdf
    • http://domobifotuza.sportsontheweb.net/97486274383.pdf
    • http://ledozikatiresev.scienceontheweb.net/mamefululixom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_7093ee4c76e543b1b8ef4841b92a0576.pdf?index=true
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_52228b6228fd41f08790c626892dba92.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e6a2c1a7-b2bb-4d6a-a23f-169461339364/xemiwetigeguritanu.pdf
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_b4630d8d001d443a82fa32395256b86b.pdf?index=true
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_ffafb2ab60a94eb0905b950d83226c5c.pdf?index=true
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_c291ce9185844468b46e1adf4d1106aa.pdf?index=true
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_975780b43ed64537b393f85373134d48.pdf?index=true
    • https://uploads.strikinglycdn.com/files/623b4341-c5a5-4789-b6dc-2163c8892e3d/sedig.pdf
    • https://uploads.strikinglycdn.com/files/aa4b0c41-79c4-4bb9-b4dd-0c49df63d27e/kusegirobejodizutog.pdf
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_85abe59c182b44d8aa427fe285a28954.pdf?index=true
    • https://uploads.strikinglycdn.com/files/929e4093-fae6-46a0-9620-9e19fc528fb1/hp_laserjet_1536dnf_mfp_cartridge_installation.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_off0000e12f.bin
7f93169a6735707a9efdbe4bff7ae540bd00b7562d625368625063d7bb98615c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 5316 bytes
font_01_sfnt_off0000f350.bin
c8078ede7dac60d9dd8c1ff49c2e9efaa68711c74bb531bce1ff0d4cf91ea133		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 11112 bytes

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