Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbb32243f0a09c4…

MALICIOUS

PDF

91.6 KB Created: 2021-03-17 07:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2106f6e76f10e98afe1a8c9ceef3556c SHA-1: 05de674e8ddd38e8fcc6eb3374120af444f8177a SHA-256: 5fbb32243f0a09c4983695ea7c338ec497f21460cdd511d113b7c0aec7cc6b14
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 of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=anglo+asian+mining+annual+report PDF link annotation
    • https://cdn.sqhk.co/xexisini/gMshihh/vinurojategux.pdfIn PDF document text
    • https://pigoresaj.weebly.com/uploads/1/3/4/5/134589591/449504.pdfIn PDF document text
    • https://metidelesaweso.weebly.com/uploads/1/3/0/8/130813592/72f93a8a.pdfIn PDF document text
    • http://rivuxini.66ghz.com/43969626520.pdfIn PDF document text
    • https://cdn.sqhk.co/pujunuzivas/hiZ1jgC/detutavubumezewabulerep.pdfIn PDF document text
    • https://cdn.sqhk.co/kadefowuvun/iiNbhdk/lidanekuxexuxe.pdfIn PDF document text
    • https://melitonewivowaw.weebly.com/uploads/1/3/1/3/131380875/remid-kesopupenitap-supiwudimaw-jivaxi.pdfIn PDF document text
    • http://xilegutopeza.22web.org/nakemis.pdfIn PDF document text
    • https://cdn.sqhk.co/mezigiduze/1ijjjOO/sopuzafugofo.pdfIn PDF document text
    • http://komomutuba.22web.org/8727138290.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/7230294.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/jh91vhd/makanedorel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_e255e76f77c5433da0fb0e67cf827eb7.pdf?index=trueIn PDF document text
    • http://wabanatebaxu.epizy.com/suxegiv.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_1916325f6598473996c41ea732a88f61.pdf?index=trueIn PDF document text
    • http://jiboleramar.epizy.com/69908103783.pdfIn PDF document text
    • http://beduxuluwuniva.rf.gd/devofub.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_ce14811d7b23447d87dc2c908f4d7c7c.pdf?index=trueIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_e1b3e00004b24948a85a420e7542ea3f.pdf?index=trueIn PDF document text
    • http://subedawulowuwo.epizy.com/proyecto_neoliberal_del_estado_mexicano_reformas_estructurales.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_502294e7af9e4462920662ab9e11db40.pdf?index=trueIn PDF document text
    • http://rufupiz.rf.gd/sound_booster_free.pdfIn PDF document text
    • http://gonidiwofove.epizy.com/ms_office_for_mac_2016.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_010b0ad57a24425da47b0785eb11e9c6.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_a3fe797eb31a459eb9dbe03a591501a4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12774 5128 bytes
SHA-256: c204f0cdf62250aed4b249c19d23991f34c61077f53dea4dfd07813f9fdbe0f0
font_01_sfnt_off000138d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D3 11776 bytes
SHA-256: a6184ac5fb9a239e69e588a4b0ed48916c1b00149e4ed21324b0babe175d1076