Malicious PDF — malware analysis report

Static analysis result for SHA-256 848655a9d4c4985b…

MALICIOUS

PDF

84.9 KB Created: 2021-03-17 17:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91e644341c86d68087e29ed563ceeda6 SHA-1: 9b54089bb7e2f956c9b9a3337f439d7bcd202a6a SHA-256: 848655a9d4c4985b9d31131441687859ccab41ddd97acb10e9742e6949b63b6a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to domains that appear to be part of a link farm for SEO purposes. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content. The embedded URLs suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/wix?keyword=daily+camera+voter+guide+2019
    • http://luwakixifotizim.iblogger.org/mepitobab.pdf
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5ff75faba0898.pdf
    • https://cdn-cms.f-static.net/uploads/4454558/normal_60464b1120c27.pdf
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5ffeefa6e2e59.pdf
    • https://static.s123-cdn-static.com/uploads/4379718/normal_6004cf5b01ff7.pdf
    • https://static.s123-cdn-static.com/uploads/4381980/normal_5ff678fc029ae.pdf
    • https://cdn-cms.f-static.net/uploads/4370054/normal_6032133b01020.pdf
    • https://static.s123-cdn-static.com/uploads/4498702/normal_5ff9292bf2fa8.pdf
    • http://setefigidoral.iblogger.org/39448595278.pdf
    • http://wovogabaposexe.22web.org/how_to_sharpen_your_business_writing_skills.pdf
    • https://cdn-cms.f-static.net/uploads/4470524/normal_60412c4c996d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dixasimoxipux.rf.gd/32556402455.pdf
    • https://s3.amazonaws.com/difigomisosak/60220299596.pdf
    • https://s3.amazonaws.com/bopuxosavubare/british_english_books_free.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_3fe5b26c3ac24add934e489651ad3d0f.pdf?index=true
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_612b39943df747d099eaa4a4693ede25.pdf?index=true
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_9b255afbc72247049f3546d43c32eb30.pdf?index=true
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_89cbc9f824c4425498ea1783314a6a9e.pdf?index=true
    • https://s3.amazonaws.com/lowebemuwojiso/seamless_christmas_background_vector_free.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/xukesurutonorativapepi.pdf
    • https://s3.amazonaws.com/fejakixoweka/masque_bar_gold_foil_sheet_mask_instructions.pdf
    • https://s3.amazonaws.com/tutasujal/costco_acai_bowl_nutrition_information.pdf
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_ea3bbfebcfc04db49d04a17c00494ac4.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_off00010dc6.bin
18bef72c8413672b4802d9d55dbfb509bd4b42287522518b712e8f7d8dc755c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 5724 bytes
font_01_sfnt_off0001214c.bin
558d4844d5ec31e10260115774d500a5e3831569469baafc1638d95f24d84537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 10756 bytes

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