Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c7060ae512df0f…

MALICIOUS

PDF

81.9 KB Created: 2021-02-12 23:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85d90322a8c8b8dfe6a5851fb21c079e SHA-1: 4f2d009f2476e6fe55d40bce9d31a1148f2b8ba0 SHA-256: f0c7060ae512df0ffcde2faac7f7f76f1b58c6d85e60a9b0593fec88276e1747
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous external URIs, many pointing to disposable domains and employing UTM parameters, indicates a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=all+star+karaoke+custom+cdg PDF link annotation
    • http://gouliwer.online/year_of_the_rabbitkdlgk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5fd15365004b5.pdfIn PDF document text
    • http://prostotit.site/lvnement_annie_ernauxi3z3y.pdfIn PDF document text
    • http://fortuneocredit.com/15402276423s18k8.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/fih3hhr/tiles_hop_forever_dancing_ball_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/eBjePgh/36395006500.pdfIn PDF document text
    • http://vinorama.fun/warhands_epic_clash_pvp_games_onlinevm8dl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481072/normal_5fee542252cfd.pdfIn PDF document text
    • http://koolmaxt.online/571121354929eabh.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/gEe1f3h/13556550714.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/UgfZg07/sarodekuturodowanoloxasu.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/hdhggjl/15826756058.pdfIn PDF document text
    • http://daimontimur.org/81172790102ohque.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/DESJigT/super_nintendo_mini_pixel_perfect.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5fe287994bd52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 5312 bytes
SHA-256: 00d686459069b19586ccbe2451baa7c232d173c40db9765bf2f9a422c394cf20
font_01_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 11504 bytes
SHA-256: e75580a75c2b1aed0cb9184377b5526813143cbf692e629af9d1addced64f17c

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