Malicious PDF — malware analysis report

Static analysis result for SHA-256 eede6e86430c6857…

MALICIOUS

PDF

80.7 KB Created: 2021-04-05 12:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6bf89544022e08265c7b5792cd30a892 SHA-1: 61c0e321ccc342fd43bba3e89d2c99248d60741e SHA-256: eede6e86430c68579dd11219516ca49a199796b876b37d5ee3882846170b9123
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating a link farm. The PDF contains numerous external URLs, with one suspicious URL pointing to 'xezojetit.ru'. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=a+level+chemistry+periodic+table+aqa PDF link annotation
    • http://wukifiduputafeb.22web.org/problem_statement_format.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/d5r4Pjg/bedwars_map_schematic.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/hfjfheT/swiped_fruits_2.pdfIn PDF document text
    • https://nelixifejesuvol.weebly.com/uploads/1/3/1/4/131406681/lafij.pdfIn PDF document text
    • http://kezerojipogut.iblogger.org/heart_of_worship_chords_d.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/1dcabd52.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/ieIFje7/metafokawoxujukovubogu.pdfIn PDF document text
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/9439476.pdfIn PDF document text
    • https://kuduvoga.weebly.com/uploads/1/3/4/7/134745106/jujinogo_tezezi.pdfIn PDF document text
    • https://detubutil.weebly.com/uploads/1/3/5/3/135348338/datefuzonozukiloz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_a9801f20551b41f4a3312dfadd9fd36f.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_aaf1a62309b9405f8c4d880cd246ef59.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_0a4e9bdde87c4c08a7bccd8fd7765f79.pdf?index=trueIn PDF document text
    • http://mageparojepu.epizy.com/75170935219.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/17726006958.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_41b51240040846819faa96ae505d141a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jawusawar/danny_and_the_deep_blue_sea_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/kugimorafobakuwak.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_76f59e18f17b49f5819c490937eb0527.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 5412 bytes
SHA-256: 45fe97f0e4c53e3f1da095c1301dc3db4a5d77d619bdcb0850d8cea4cd7b5f38
font_01_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 10888 bytes
SHA-256: d58d1f6dd1fbc68c06fdb2eac7b5d297621d3747e751d3c4a55b6b5357bb7427
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378