Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dccc6fa083eb902…

MALICIOUS

PDF

77.7 KB Created: 2021-03-19 22:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9ddc1f02a997764935dcfae18d0ed3da SHA-1: 91d498cb2cde460109fbb21caeb88f543614b9de SHA-256: 9dccc6fa083eb902bb9584d0bc4c0d87e94b16bc5b349acf0d58f3633a2743e1
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 and embedded URLs, many of which point to disposable hosting or link farms, suggesting a distribution or phishing campaign. The document body is heavily obfuscated, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/award?keyword=sports+vocabulary+esl+pdf PDF link annotation
    • https://cdn.sqhk.co/taviboku/degfqp8/mx3_pro_air_mouse_review.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/63110399091.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/21241255739.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5ffd25474c973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5ff29e0372e62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496605/normal_5ff1ae6556aae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412607/normal_5ffd48214c0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5fd6815cb3d0c.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/hi91LIF/naval_special_warfare_recruiting_directorate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472501/normal_602c3e3a9216f.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/60902038606.pdfIn PDF document text
    • https://cdn.sqhk.co/xovenekot/hdhb39l/vauxhall_chevette_hsr_performance.pdfIn PDF document text
    • http://minuzozudutaji.iblogger.org/wadexidelabefebodiban.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_602d7ac194bce.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/pgAhdgc/ripemanesupagurelegijegex.pdfIn PDF document text
    • https://cdn.sqhk.co/lajagika/D6ihWge/96268191421.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapanowi.epizy.com/comma_worksheet_for_2nd_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/98366483037.pdfIn PDF document text
    • http://davivizuvazofa.rf.gd/jotobevivumufezake.pdfIn PDF document text
    • http://xasagode.myartsonline.com/serode.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/land_sale_agreement_format_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/mulobagozesolukidum.pdfIn PDF document text
    • http://wesekiluxalema.rf.gd/44428680016.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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 5552 bytes
SHA-256: a521f6410fab216c072acf9f90c4dfab54d58d3893e1ffa0012fbadc588f88b4
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 10904 bytes
SHA-256: b6de1dc31d65cf1ccc3bd87dd0c52ba93cf65cde4d95f5d675d15e40df75f846

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