Malicious PDF — malware analysis report

Static analysis result for SHA-256 924e725aa94db83f…

MALICIOUS

PDF

74.8 KB Created: 2021-02-22 02:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 631535acfd3b96287102217fcce823d2 SHA-1: 856341168880849c7c341ba386896a0643cb70e0 SHA-256: 924e725aa94db83f938eef461ad3c867fd6c3bac5745dbec09f98a4adf7eb891
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to disposable domains or potentially malicious hosts, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to manipulate search engine results or distribute malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/wb?keyword=sennheiser%20ew%20100%20g3%20radio%20mic PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc985ffce4f3.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/haJ4jf7/defamobawi.pdfIn PDF document text
    • http://gakmancreatures.ru/niwikurotidifewegoruropijligq.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/4097958.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/cqgjJyX/teronij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5fc7a7a88724c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_601160848312d.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/marelixogix.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/6gjhjBi/17333831336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415300/normal_5fffd91fc91fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_5fe881856746c.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/logcCQQ/xejejowebutiwu.pdfIn PDF document text
    • https://jasebezaf.weebly.com/uploads/1/3/4/6/134630561/padixaka.pdfIn PDF document text
    • http://espaceabone.com/4936123380336yt5.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/hzig2ij/14496047034.pdfIn PDF document text
    • https://cdn.sqhk.co/luwukamuku/jb0S9w2/57618018441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gozilum/crescent_lake_fl_fishing_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/avg_pc_tuneup_paid_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/m._a_pass_full_movie_free_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/ridufup.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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 5876 bytes
SHA-256: d01405707fae82ac199d5fd86732dad5710c3cc09dcc2d7eed45f5a3bf8dd861
font_01_sfnt_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 22508 bytes
SHA-256: d0781f78011f17df32753d783d326e0ca6652e1e9f157f75bda38047035e6bc6

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