Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e91b25758215792…

MALICIOUS

PDF

83.3 KB Created: 2021-03-31 21:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38d9fbde09be140680d5f2d6de0ef589 SHA-1: d41c8332d40a08f0d0452f2fa4d05170728e2400 SHA-256: 8e91b25758215792f6947163a036a88cae374cfec47104211fd40d70926258d2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, with numerous external URIs pointing to various domains. The primary IOC is the URL https://maypoin.ru/award?keyword=exercices+l+article+partitif+pdf, which is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/award?keyword=exercices+l+article+partitif+pdf
    • https://cdn-cms.f-static.net/uploads/4465403/normal_5fe8e5cf83ee1.pdf
    • https://cdn-cms.f-static.net/uploads/4368772/normal_602a41dd6b00b.pdf
    • http://xosijitede.22web.org/68043930266.pdf
    • https://cdn.sqhk.co/jebixusugak/EMgM6jg/fujanineba.pdf
    • https://cdn.sqhk.co/leredupodeka/d8deyjf/pujiwufezukobisakorol.pdf
    • http://tisimewifexumi.iblogger.org/ranemavojuku.pdf
    • https://cdn.sqhk.co/vopofuxo/giUvb1V/dragon_blaze_first_impact_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4490375/normal_5ff3fc479e38a.pdf
    • http://vibomolivizim.iblogger.org/63975307800.pdf
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fd0f21152c96.pdf
    • https://cdn.sqhk.co/gutemokerezo/hjbpYvO/ps4_emulator_pc_download_uptodown.pdf
    • http://pedugubugof.mywebcommunity.org/can_you_convert_to_word_on_iphone.pdf
    • https://cdn.sqhk.co/fifibaje/GgfjjhQ/work_design_industrial_ergonomics.pdf
    • http://figimumagoko.mygamesonline.org/82330714512.pdf
    • http://muzibatixabu.mypressonline.com/fuxixinuxas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/568718a4-6ab3-4b73-99b5-0ecbff2aef05/libro_ciencias_2_fisica_secundaria_santillana_2019.pdf
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_00d6a7bfcc9d48f68a15de8ea2f710db.pdf?index=true
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_a4c16274806447669114b2de66d55a5d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac1b7668-aa3c-4ab8-b1ee-ccda4ec77ecc/jotiwinibetekoxukigalo.pdf
    • http://jilejulo.epizy.com/xitowurunawofokememuzaz.pdf
    • http://lotawom.rf.gd/dapejuba.pdf
    • https://uploads.strikinglycdn.com/files/edac2f25-7a03-457e-88cd-eb215e828b7f/adobe_photoshop_cs6_tutorials.pdf
    • 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_off000101c7.bin
afa613f16a737eed136ea0f8a42d37c2044c627f5c1fa214b38114386495bce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 5172 bytes
font_01_sfnt_off0001137a.bin
28d6315e7c5092bd56ff9bcd5e0c2c9f4fb45399f29c661374b3f349a1c6a22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 13872 bytes

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