Malicious PDF — malware analysis report

Static analysis result for SHA-256 4416ac2c43662063…

MALICIOUS

PDF

67.7 KB Created: 2021-04-09 17:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f5ee270389944da7715c29b93c1e22d SHA-1: 5828a30f903aa48151c0ee6649861a69cb9ff997 SHA-256: 4416ac2c43662063aa57fdc75d59406f83ec91d9a326c52b230dc8614d4f867a
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm. One prominent URL, 'https://resalured.ru/strik?utm_term=monster+girl+encyclopedia+series+download', suggests a lure related to downloading content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://resalured.ru/strik?utm_term=monster+girl+encyclopedia+series+download
    • https://cdn-cms.f-static.net/uploads/4386613/normal_601a9e6f36a24.pdf
    • https://static.s123-cdn-static.com/uploads/4464068/normal_5fe0ba11b14be.pdf
    • http://rejamar.sportsontheweb.net/javukigidabomanakapogikeb.pdf
    • http://wotidoteked.mywebcommunity.org/61049038331.pdf
    • http://gekifek.scienceontheweb.net/rejisuwiwamomaxepej.pdf
    • https://static.s123-cdn-static.com/uploads/4456984/normal_6004a62887842.pdf
    • https://cdn-cms.f-static.net/uploads/4368225/normal_604dc45eb1187.pdf
    • https://static.s123-cdn-static.com/uploads/4457848/normal_5ff614654de40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_55cb0ca2f4194419b939335ff472cf23.pdf?index=true
    • http://dirulibas.onlinewebshop.net/vozevutekoze.pdf
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_a46ee23f9fd94d00bcf8d71c186a6eaa.pdf?index=true
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_d03821ef8a864cc888b92b6550009eaf.pdf?index=true
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_97bb1fdb380d413c87efc8bfec5f5a5d.pdf?index=true
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_5c3aa0e4f6ea4aabb3da71f2bf02c835.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd0b36b7-26ca-49c9-8c1f-737e9b7cdb9f/hp_laserjet_p2015dn_icons.pdf
    • https://uploads.strikinglycdn.com/files/abc9feb5-16d1-4881-88fb-d90d2a7c2c45/how_to_disable_spanning_tree_protocol_on_cisco_switch.pdf
    • https://uploads.strikinglycdn.com/files/d9942b84-4b01-4dc8-ada7-99cbec0e9e3c/alkaline_food_list_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/5ac66150-7cf8-49bb-993d-e455e378f081/81714947354.pdf
    • https://uploads.strikinglycdn.com/files/7943f94b-2a45-4566-964e-1fead6d2f9b9/rerov.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_off0000c8be.bin
88426feb740f52ff99fa08a55e7d9b86d2f1cc9cb73630a63cebd2c194c44c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BE 5440 bytes
font_01_sfnt_off0000db71.bin
c8623323729b8bf6c81e01c1d3d91f8d1e7b1ef5dff4e0578fca9b7b66d9abd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 11356 bytes

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