Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cea421d680a8acf…

MALICIOUS

PDF

81.8 KB Created: 2021-03-28 13:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35c86e27313e4249421fcfff41b06bb2 SHA-1: befec952b1026d0bda44663cb6be9b3745aba72c SHA-256: 2cea421d680a8acf4c869c487f17dbfad22266ac093e3fac9b1a7e9ea2c768d4
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings. The document body, though heavily obfuscated, suggests a lure related to 'millionaire to billionaire games', which is a common theme in phishing and scam campaigns. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=millionaire+to+billionaire+unblocked+games+77
    • http://kojijeku.mygamesonline.org/12326134962.pdf
    • http://tagepalalog.iblogger.org/78687865652.pdf
    • http://forajadafogaxuv.medianewsonline.com/bapitetibom.pdf
    • http://benovezim.22web.org/flow_cytometry_report.pdf
    • https://rimuzunij.weebly.com/uploads/1/3/4/0/134095873/temufozaruta.pdf
    • https://buvijolijesikuv.weebly.com/uploads/1/3/4/6/134602818/9304239.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0631a707-cc41-411c-80d6-94897700cce2/74086171291.pdf
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_c2d9e784d57d4b378f7be910f0551a88.pdf?index=true
    • http://nakeviw.myartsonline.com/dexeluwijisuz.pdf
    • https://s3.amazonaws.com/mizeteb/bms_performance_sales.pdf
    • https://s3.amazonaws.com/tokafanawa/elk_m1_gold_security_system.pdf
    • http://tirisesu.onlinewebshop.net/16106161059.pdf
    • https://s3.amazonaws.com/nopomewegobij/90498325564.pdf
    • https://uploads.strikinglycdn.com/files/58f31da1-bf1e-4924-94e3-3d11560a2932/delopefalavuso.pdf
    • http://ruzowedomox.epizy.com/bible_kjv.pdf
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_b21a0869761341ef8cfead554ce6293d.pdf?index=true
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_94afe10aac5a4586b35894f6e22fa98c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf0b4df7-c790-4e8c-bf55-7e37785f0c88/88251886602.pdf
    • https://s3.amazonaws.com/jitimesolagun/formation_pour_auxiliaire_de_vie_scolaire.pdf
    • http://xirexadugimog.atwebpages.com/adding_exponents_worksheet.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_off000100d7.bin
1cb82b6a7e0b15410d9e82a1c6a609b9ac67c8549bf7445e6c26c71b84b17dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 5548 bytes
font_01_sfnt_off000113ad.bin
d810f482427553cbcab57fd714662cd545f1069cde5c1feb51159ff73f12ffb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 11156 bytes

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