Malicious PDF — malware analysis report

Static analysis result for SHA-256 256876b9ed1b0313…

MALICIOUS

PDF

76.6 KB Created: 2021-05-03 18:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f5a61b3bb509d7b3d0ee829c52c4a1a2 SHA-1: 54599c00dfa61f3c2a6f12e402be5c0ca7f8fefc SHA-256: 256876b9ed1b0313216e265d8b81b177432b241718656dfa0bb6f53132193c39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=are+sat+cancelled+for+class+of+2021 PDF link annotation
    • http://flathead.us/pevanoxozafirirejebta55y.pdfIn PDF document text
    • https://zisupozukubowad.weebly.com/uploads/1/3/4/6/134678668/zekexukunok_jazupibiten_dukusozoz_femepogi.pdfIn PDF document text
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/8462526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_6048700a14ebe.pdfIn PDF document text
    • http://figironeme.22web.org/contrastive_distribution.pdfIn PDF document text
    • http://cmb-eco.com/bunubekakigivukot1y6no.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426277/normal_602ac9a8abba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_6020c1d0cf094.pdfIn PDF document text
    • http://damvglaz2.xyz/simply_keto_suzanne_ryan_instagramecv7f.pdfIn PDF document text
    • http://modernstyle.pro/2005_dodge_grand_caravan_pricesgs9yn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_60153f9c1276b.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/xidikororokazag-lesupalunute-bebesuma-nazuzalaso.pdfIn PDF document text
    • https://nikidedinuxilal.weebly.com/uploads/1/3/1/4/131437821/patese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_6023694503327.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donopopasuxek.epizy.com/68164924941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5a6795-c1d4-46c5-97b4-eddea4231198/why_america_is_not_the_greatest_country_in_the_world_script.pdfIn PDF document text
    • http://femimiwavexu.epizy.com/gofenemiwobubetizemujela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ef3969-1898-4fc4-bfe4-bfc95867f184/29072981850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232a0713-c78a-45fb-955e-bba06e802d70/how_many_covid_cases_in_my_postcode_scotland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad74956-4bd5-4d4e-8308-bc6179c92a95/how_to_sight_in_a_barnett_jackal_crossbow.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_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 5332 bytes
SHA-256: 0e68b74e78548b46342bc39862d3d498533b90a91749dba6505e329b83b0cc37
font_01_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 11072 bytes
SHA-256: ee957bc8a28f7057e6f1567da2a061eaa96fab0325d1decf74caa035dc62a230

Open this report in the interactive analyzer, or submit your own file for analysis.