Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4e3050dc955aa8…

MALICIOUS

PDF

79.6 KB Created: 2021-04-01 04:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bfa70d305adee8e6fd4dfa8d2578952c SHA-1: f8ff7fb431499e61755878634ccd228f4f896be7 SHA-256: 4e4e3050dc955aa840d30432fcc702a6090403dc916dcab537d344feb4764996
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=lord+narasimha+kavacham+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448345/normal_6047dfaf786ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366317/normal_5fc8de41a0016.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/97275320783.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/didokilegigorilim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_5c2b3e58739d45e3a5910e4ccdd11e04.pdf?index=trueIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_d3f805ac58bf42dda1e8589e79fe309f.pdf?index=trueIn PDF document text
    • http://lonesopuw.onlinewebshop.net/57521218020.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_58b34c8b4b7e49a5847ac125411c8e1f.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_9aad71fbf60548f3945d7fc1811f9dca.pdf?index=trueIn PDF document text
    • http://lixutepojux.rf.gd/21858717979.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_f5d645decff844018576ad8d5dd66eb8.pdf?index=trueIn PDF document text
    • http://lazavosapazogil.epizy.com/toto_catalogue.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/9th_grade_algebra_word_problems.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_317f3b2621f14ea3a96c31c00a760b15.pdf?index=trueIn PDF document text
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_13f94b0ce49e4f13bfa96bddf16075ef.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_397dd4a37cbe4a63820d58b64899eeaa.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_949144bbd4934401893f966a78c8db88.pdf?index=trueIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_36e6d7528f2b4e39a545d792b2f0cdd6.pdf?index=trueIn PDF document text
    • http://xojakejib.epizy.com/xiwaz.pdfIn PDF document text
    • http://kokomato.epizy.com/symmetric_bilinear_form_equivalent.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_56dcc5542849440cb1e64d32f7cc9549.pdf?index=trueIn 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_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 5428 bytes
SHA-256: c47e857dfa1ed2ae404faa0c68fd39767e0643747d3f5238c3d40d1a3c7a2f65
font_01_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 10864 bytes
SHA-256: f99ebc3584d86d9048d2f4c3bc8ef42ceae6ca5be81786fa92be118eaa21bb8d