Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dffed4d2412471f…

MALICIOUS

PDF

73.9 KB Created: 2021-02-24 07:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2314b2ace087c4612c84d50be7b5f916 SHA-1: 51141c3a9636612c41f332eeb0622058ad186f3a SHA-256: 5dffed4d2412471fbb3fb34ea6c7ab78b07453f63fdf6d64665146a53c1c75c1
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs that lead to external websites, some of which are identified as link farms on disposable hosting. The document body, though heavily obfuscated, suggests a lure for downloading software, specifically mentioning 'mortal kombat x android mod apk free download'. The presence of numerous external links and the nature of the content strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=mortal+kombat+x+android+mod+apk+free+download PDF link annotation
    • http://wunawuwome.22web.org/activesync_win7_64_bit.pdfIn PDF document text
    • https://bunofavaluz.weebly.com/uploads/1/3/4/6/134661637/nadega_rebubawekes_pevulavuwupal.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/rjcox4x/95636686973.pdfIn PDF document text
    • http://sanasesuj.iblogger.org/all_video_er_free_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/5fhiibZ/chocolate_frosting_cake_decorating_ideas.pdfIn PDF document text
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/8895498.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/pha83ic/switch_pros_sp_9100_install.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rokupin.rf.gd/hp_5510_printer_not_feeding_paper.pdfIn PDF document text
    • http://mafakizukizunof.epizy.com/debofisaratutukexalo.pdfIn PDF document text
    • http://tezajiduzut.epizy.com/piwaboxapezuseside.pdfIn PDF document text
    • http://pijiwir.rf.gd/freedom_fighters_game_for_pc_free.pdfIn PDF document text
    • http://posijibanif.epizy.com/kozerawo.pdfIn PDF document text
    • http://judixipe.epizy.com/jumping_jacks_in_spanish_slang.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_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 5376 bytes
SHA-256: cd6c334c354a25bf7879e371a294b46d16219e0b8bd5e816f06d1865214d1ad9
font_01_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 10184 bytes
SHA-256: b4518289342acc303537bed88a4558f3e4bb957a6e4e67e7d71bf286c2c6df6f

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