Malicious PDF — malware analysis report

Static analysis result for SHA-256 c721220209cd7157…

MALICIOUS

PDF

77.6 KB Created: 2021-02-11 18:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8c96683b6926e60e666d46576437146d SHA-1: 160e3c316782df58085170bde946850bdc0a989c SHA-256: c721220209cd71577ee0518ed162f4cf909ae558517398467173cba430c3ddc2
134 Risk Score

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. It contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm designed to trick users into clicking. The presence of external URIs and the overall structure suggest an attempt to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bicycle+road+sign PDF link annotation
    • http://dupomixu.iblogger.org/mosufubugikawevesolipuwew.pdfIn PDF document text
    • https://verosogoteri.weebly.com/uploads/1/3/4/7/134738646/repumoxafu.pdfIn PDF document text
    • http://vuwadezizubem.22web.org/agenda_example_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ff63407d198a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fe9617631129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_600d5f5fa9572.pdfIn PDF document text
    • http://zajowidased.iblogger.org/path_of_exile_immortal_syndicate_guide.pdfIn PDF document text
    • https://wademaleg.weebly.com/uploads/1/3/5/3/135346716/b4dbb77dd1.pdfIn PDF document text
    • http://wedagumo.iblogger.org/limiting_reactant_worksheet.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/xudomolutuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389603/normal_6004d920e098a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://binaxasomeroxat.epizy.com/54680333122.pdfIn PDF document text
    • http://kajiwuze.rf.gd/college_gpa_calculator_excel_template.pdfIn PDF document text
    • http://fanixagef.rf.gd/swan_lake_sheet_music_piano_easy.pdfIn PDF document text
    • http://fasokefukolu.epizy.com/schizophrenia_guideline_american.pdfIn PDF document text
    • http://mewozukejos.rf.gd/cognos_report_studio_insert_page_break.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/62056064378.pdfIn PDF document text
    • http://lesizemub.epizy.com/debifater.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/xetovekidubim.pdfIn PDF document text
    • http://lumuwejonalar.epizy.com/45506030850.pdfIn PDF document text
    • http://wemiwapava.epizy.com/crinkleroot_s_guide_to_animal_habitats.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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 5260 bytes
SHA-256: eeab593a400580a67d6a891803ee3d4dec4b633ff345550b13a8fafd0879216f
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 11192 bytes
SHA-256: 94954c8e01aead5815fa4f9bf2f3b0401c975e2f8fcbf7c37186f5ddaae45b38

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