Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4b591d0b565a64…

MALICIOUS

PDF

77.4 KB Created: 2021-02-22 18:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9baf10517729b6c467e674752b76eeb3 SHA-1: afd35caba7a91ca2ea25b2184a0b7cb73386032e SHA-256: 4f4b591d0b565a645eb690a3f85742efeb624f08a8c49684cb6b0fb84ba23943
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://jottigo.ru/123?utm_term=neuropsychological+testing+child+cost PDF link annotation
    • https://cdn.sqhk.co/purorenutuw/ghbLTge/rufajitixosumuvawosu.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/igh6tlQ/fist_of_fury_donnie_yen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376087/normal_6000cc2d27cff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_600f5ddb8d727.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/dhjjdgj/free_phone_tracker_app_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_603312e26cda5.pdfIn PDF document text
    • http://vukogosapejofa.iblogger.org/fixijuvuru.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/gfii3tz/4761853910.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/sd9jicO/97211485426.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/fjgiiiJ/wubijuxujowivabuvare.pdfIn PDF document text
    • http://japuxivofag.22web.org/golomuvivufigo.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/739779705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5fd23c9e6bf32.pdfIn PDF document text
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/kanowiti-mudosavufe-bivekatefap-tuvetud.pdfIn PDF document text
    • http://womotov.22web.org/volume_of_3d_shapes_ks3_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/xhavifj/20149615265.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuletesowugi.epizy.com/xunopizozarasu.pdfIn PDF document text
    • http://kisitibonadal.rf.gd/dokepawodakufe.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_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 5408 bytes
SHA-256: 3276c15479b1941101e7d4d5d1890826dc3d3a6e98162d4fb68827e01488fd9d
font_01_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 10708 bytes
SHA-256: a255ebff0edb065fe0d5f9ac49bc9400a4e631f309e5731009b1754f958a1c67

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