Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97e60547a4477e0…

MALICIOUS

PDF

80.0 KB Created: 2021-03-18 22:24:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 3f783a8b95bf1ec3ba00e9ac265a662a SHA-1: 2d7dfff84fd3a3ada20c170bec528adc6c40d845 SHA-256: d97e60547a4477e0ae29d12b170f497f43ae289e625a6a4e485ae928a63474a1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and heuristics point towards the exploitation of PDF vulnerabilities or social engineering to redirect users.

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://nipisod.ru/strik?utm_term=strength+training+workout+for+runners PDF link annotation
    • http://eferevole.com/86346628759qaj0b.pdfIn PDF document text
    • https://zefipomez.weebly.com/uploads/1/3/4/8/134882075/09d2c8cb68115c.pdfIn PDF document text
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/8615774.pdfIn PDF document text
    • http://meetsalle.xyz/700x_reloading_dataoefek.pdfIn PDF document text
    • http://trells.space/6_45_march_16_2020kzawd.pdfIn PDF document text
    • http://mamontov-net.cc/82717347682avrdh.pdfIn PDF document text
    • http://sabowupab.iblogger.org/30105875134.pdfIn PDF document text
    • https://gurufikenifa.weebly.com/uploads/1/3/2/3/132303388/41864f167f915.pdfIn PDF document text
    • http://smartcreditcheck.info/how_to_turn_off_samsung_rf28hmedbsrrzw9i.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/vabexotasakur_zarezitabuka_bemibexitumurel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_80975774253e4e08ae5d21ed4d321f6a.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_2537181653f947188b38bd7c7393b6bc.pdf?index=trueIn PDF document text
    • http://jetumodegupejit.rf.gd/ribivufodubab.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_6a379bf126e84544947e0c2c5fe46d3a.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_8880606f752644879d40d9f348b58e48.pdf?index=trueIn PDF document text
    • http://jawegoxizifiti.epizy.com/gladius_wow_addon.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_268029fdd81f41ab8fc796ed9d74a097.pdf?index=trueIn PDF document text
    • http://sevobademimebij.epizy.com/black_s_law_dictionary_free.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_12759c34c3f3469e983700f488ceb533.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_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 5256 bytes
SHA-256: 41fbf717edb9eca19828221768d0cd24a15392dc40a83df37e26f0e725645381
font_01_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 11608 bytes
SHA-256: d86074b6de399ad3e43360bd9358b03e4dec5d1ac8b118b2500238dbd163755d