Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a62c9a2826185c…

MALICIOUS

PDF

89.7 KB Created: 2021-03-29 01:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9c8ba4613f412c3208d79ad5bc12be1e SHA-1: a0b25aa5379d659b5c3114355869e00be01a6251 SHA-256: 90a62c9a2826185cd86f6c0159d04d0e9d00f6b7b66d255b9f4273a8d9ff598e
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The presence of a 'sales representative agreement sample contract' in the document body, combined with the heuristic 'SE_INVOICE_LURE', suggests a potential phishing or scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mezovuduw.ru/wix?keyword=sales+representative+agreement+sample+contract PDF link annotation
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/denomuvoxiwu-kibetewukagumi-babupo-xobow.pdfIn PDF document text
    • http://juwolopuga.66ghz.com/vegas_pro_free_16.pdfIn PDF document text
    • http://sadutubirewox.22web.org/xitukekaritixojo.pdfIn PDF document text
    • http://toxusuzom.mypressonline.com/balance_sheet_and_income_statement.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/38296842186.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/dotitapudosofev_zelomamat_riguvuje.pdfIn PDF document text
    • https://garovinarabibaf.weebly.com/uploads/1/3/5/2/135293384/153a1ad4f29a.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/f6510e9.pdfIn PDF document text
    • https://tajafakedebufu.weebly.com/uploads/1/3/1/4/131438499/nevox.pdfIn PDF document text
    • http://vozaxakinexu.iblogger.org/vejiga_neurogenica_diagnostico.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e96a04-2fda-4006-844b-8c6628d7ce32/google_maps_3d_street_view_online_pakistan_lahore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935485d0-41e4-4134-aedb-c37ba9066041/the_man_in_the_high_castle_season_4_trailer_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a613b05-b211-473e-992b-6c27239840d1/how_to_use_google_maps_for_directions.pdfIn PDF document text
    • http://befatig.epizy.com/ambrosio_rianzares_bautista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0cbcdd-8bfe-430e-890e-14feb66835ed/panasonic_nn_st65jb_microwave_32l_inverter_technology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246f45a7-3f02-4e32-8215-07fd67c825e6/13869742758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c84dc0-a53e-4554-a799-59096e119db0/2001_polaris_sportsman_500_electrical_diagram.pdfIn PDF document text
    • http://givorajosi.rf.gd/great_ways_to_describe_the_sun_shining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0e32e4-546f-4359-a865-a79746bb7c8f/14245702983.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 5416 bytes
SHA-256: 64a33e7a5b383669cfc7baedc23eb24963cfcfeeffe9dae2245a632259d73efd
font_01_sfnt_off00013324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13324 11168 bytes
SHA-256: 2779ade1edb1932b51fac46b7f1556ca5a64ec19b289095d44fffd9cabfe5e98