Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9461a5582eda305…

MALICIOUS

PDF

85.3 KB Created: 2021-04-21 12:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dae6ce9b8c03f40bdf1fbd3b110e17d2 SHA-1: 3dd141b2bc00602088628b0e580e2a2723066520 SHA-256: b9461a5582eda305fd3a6a633bd704dfe69bfec82df1ab1a89e8d9f9957821ce
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to 'jumiwimov.ru', suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to an 'owner's manual'. No scripts were extracted, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a sophisticated link-farming operation designed to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=e2+hitch+owners+manual PDF link annotation
    • http://kusulapezep.iblogger.org/vokulubiniga.pdfIn PDF document text
    • http://moscowflowers.online/joloduguwudovarupesatowtv2o8.pdfIn PDF document text
    • http://rejilif.iblogger.org/13186072352.pdfIn PDF document text
    • http://indital.space/destiny_2_free_ps_plus9ujuj.pdfIn PDF document text
    • http://numusuri.22web.org/ellen_degeneres_queen_sheet_set.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/wozisoke.pdfIn PDF document text
    • http://lifeit.pro/mechanical_engineering_jobs_in_dallas_texassnfm8.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/hernia_inguinal_complicaciones.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/what_are_the_benefits_of_using_a_hyperbaric_chamber.pdfIn PDF document text
    • http://azalea.store/tesafu28tmd.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/57886385015.pdfIn PDF document text
    • https://xidoteruredogon.weebly.com/uploads/1/3/1/4/131454367/raluwepezadarozeso.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/60779835149.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemevusakeke.epizy.com/54689305882.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/jefuge.pdfIn PDF document text
    • http://nidawijonag.rf.gd/44919408185.pdfIn PDF document text
    • http://toreruvevow.epizy.com/how_much_does_target_starbucks_pay.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/79644197248.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/60390643939.pdfIn PDF document text
    • http://nufolupi.epizy.com/wejenevujosojoperesoneza.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 3032 bytes
SHA-256: a6f1ca4a9601a742fc0452ae84c9240c0ce6ab3104f6bc2573c05454bcf36461
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 5220 bytes
SHA-256: ae194b1a3d3f09b8dd9e0e69fc5b613a0bbe16969507538b0951a89f049e2085
font_02_sfnt_off00010570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 12976 bytes
SHA-256: 29b59f6cdc6d661a7a0753e14074d29f80c02db5095eaeecfe8e7754955e81c3
font_03_sfnt_off000131d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D2 16276 bytes
SHA-256: 902fd537fa51412a300ab4e92f03feaec6a63c0bd800deaed1edf71ea5499142

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