Malicious PDF — malware analysis report

Static analysis result for SHA-256 4544baee86157aff…

MALICIOUS

PDF

73.3 KB Created: 2021-04-18 04:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01cbfc0d9e9a0553e9fc8e9da88b3d30 SHA-1: e002da4d34b5cc2b730874f6b02d476a2f7dc47b SHA-256: 4544baee86157aff2b3e2d55dc0e0c829920bb1cc606bb6d534906b2094dd567
156 Risk Score

Malware Insights

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

The PDF contains a link farm and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily corrupted, suggests a lure related to TV setup, likely to trick users into clicking the embedded malicious URL. No scripts were extracted, but the presence of numerous external links points to a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=how+to+setup+uverse+remote+to+samsung+tv
    • http://badgesverified.com/4920549831dpp47.pdf
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/da6a5a.pdf
    • http://afracheat1.xyz/15002899237r444s.pdf
    • https://cdn.sqhk.co/xuwadezab/Xgfhjpw/eso_dungeon_gold_farming.pdf
    • https://nimimetifav.weebly.com/uploads/1/3/2/8/132814674/besasunuxadusoz.pdf
    • https://fugikoji.weebly.com/uploads/1/3/4/6/134611078/66eb6266.pdf
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/e5d868ed1c50.pdf
    • http://hytri.com/31583114769zdyq4.pdf
    • https://cdn.sqhk.co/fakobijo/fhchbxB/79111915614.pdf
    • https://zuripiri.weebly.com/uploads/1/3/1/8/131856797/pefatumune_jemavugat_rimigesofep_dorarobuzetuvef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e20e76e0-8db4-4913-8bb1-e23b4f9b422a.filesusr.com/ugd/237bf7_9b117be5de164d5ab32f8e27fffad638.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f899d9be-fa81-4ed4-a202-9e9d21f94e8d/ancient_magus_bride_episode_22.pdf
    • https://uploads.strikinglycdn.com/files/69a9862d-1d3d-4c2c-a0e9-76a92069cd08/ximufanifenejagaparozomo.pdf
    • https://uploads.strikinglycdn.com/files/70b0b314-0156-4522-9409-e80548fd6eb6/french_verb_conjugation_chart_recevoir.pdf
    • https://uploads.strikinglycdn.com/files/201809e8-9598-4aba-82c2-baddddd9386c/genaxuf.pdf
    • https://uploads.strikinglycdn.com/files/c948041b-1a18-4270-9202-22e1cc5d4e3a/pogagikozorokesod.pdf
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_0f5a443f304d4740b50d1350e36a4d15.pdf?index=true
    • 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_off0000e345.bin
d751830b34bd7d396e7d18fe8773f290f6f727fa4797191c44c5d02ffc8c2c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 5220 bytes
font_01_sfnt_off0000f509.bin
643b5f0fc7a1a388b5ffd6234b79050bae57ceaf60b3cb3b2e075a3b0d9565c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 10328 bytes

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