Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c406aab2245a04f…

MALICIOUS

PDF

107.6 KB Created: 2021-03-24 11:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 084954f13ee93b709d102d5aae04b3ca SHA-1: ed38f338d96ae9e6d5200e2f1836c15ca01da9e6 SHA-256: 5c406aab2245a04f7f5c1fab7769eb4c477f8205feabc9ef39e65f5807833cbc
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URIs pointing to external websites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a high likelihood of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=the+pursuit+of+happyness+worksheet PDF link annotation
    • http://xodorewekaja.22web.org/mesemag.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/how_to_jump_start_2008_ford_escape_hybrid.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/kusawilajapanil.pdfIn PDF document text
    • http://milanomoda-italy.site/kifuraresurizexanpjw2.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/jarhejg/7984911630.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/27145445377dmwwd.pdfIn PDF document text
    • http://arendagg.xyz/50290754891sdgi0.pdfIn PDF document text
    • http://wugegifa.getenjoyment.net/biological_science_notes.pdfIn PDF document text
    • http://ripuxojelirul.iblogger.org/1251422546.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/ThhP7hg/vpn_super_unlimited_proxy_mac.pdfIn PDF document text
    • http://rasprodavaika.ru/husqvarna_450_rancher_carb_removales5d8.pdfIn PDF document text
    • http://tophomework.space/soccer_heads_premier_league_2020u6d4e.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/47821376500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_605adba6c05da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5ffa2da52fcc6.pdfIn PDF document text
    • https://cdn.sqhk.co/jamenediged/vHGR7jf/worksheet_maker_handwriting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/somupupurenetovexe.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_off000165b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B8 5164 bytes
SHA-256: ec54fbc8974db84f8b4541098a1c3440a11828367b62bdacd21fa0b996dd7a3d
font_01_sfnt_off00017759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17759 12132 bytes
SHA-256: 7ec2ed9ed7e06309c961f06ab9eae6a8f29110a789e41b41da90e9a6dfb018fc

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