Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74ef02ac51c2703…

MALICIOUS

PDF

77.5 KB Created: 2021-03-04 23:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7bb7af5700dcac870180b727bff22170 SHA-1: d8c7f8f0cddc5058f15ec990ec3041c8c9cb16fe SHA-256: e74ef02ac51c27039ab05dbac0514e65ed76a0948132698401a30e023d096ff0
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.999 further indicate malicious intent. The document body, though heavily obfuscated, contains a question that could be used as a lure to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/award?keyword=what+types+of+activities+or+hobbies+do+you+enjoy+outside+of+work PDF link annotation
    • https://linugezi.weebly.com/uploads/1/3/4/2/134265501/765f863.pdfIn PDF document text
    • https://wurixexaf.weebly.com/uploads/1/3/4/8/134865586/fatabonadilepux.pdfIn PDF document text
    • https://loruwudo.weebly.com/uploads/1/3/4/7/134738316/4a50e91e66ace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485930/normal_5ff02c0fb7e34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402964/normal_603b1f333acd2.pdfIn PDF document text
    • https://galanopudaxu.weebly.com/uploads/1/3/4/1/134109153/2928830.pdfIn PDF document text
    • https://rajuputodetu.weebly.com/uploads/1/3/4/6/134682309/e7b788a77f6d.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/vajojanazefumajapazafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367912/normal_60017b6025376.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/samsung_rugby_2_sim_card_size.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373522/normal_5fee089eec09c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3217c0a-f576-42de-881d-02d47930f1d0/dujofixumibewotibotoz.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_ab8648fae9f14d50b6c407ef8f7f520c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55f82cb-c3d1-4a06-8f6a-e5f3804bb14e/15010374807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9e427c-b9a4-4e0b-84f1-5f0bf5a36828/82027064808.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_e1a798d44d5f427993ca65979f1dd548.pdf?index=trueIn PDF document text
    • http://xemunebo.atwebpages.com/4725479717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e1558d-a989-41d5-9780-419ab8447d08/32375709409.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_b614777de8a840dfb413a068de241939.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_04468fd28d3b48b1b15403ffbe3fcfd4.pdf?index=trueIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_f646e9bdc68c4259b1e3e1454fa3c9ae.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_d36fb97aa1e747cca7583e2c57b484b0.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_22aa118434544dc2926d4f046d7a68dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8977c2a1-6469-4e19-8f59-7ca73e4f6446/98019538251.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 5760 bytes
SHA-256: 1d839efdd2d172be23e3df577ea5eb7dcb314ba077432a41f958a198b9d2e497
font_01_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 10208 bytes
SHA-256: f854bd3c0d928f60a64234a1e40971e85ad1a5a1d2c03de53ae3911376465f19

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