Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcd11844f19e03f…

MALICIOUS

PDF

73.6 KB Created: 2021-03-14 14:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ebab6a209115acfbb64982f0394ad887 SHA-1: 04aba6d9e227f2d444a2e14ceff1afdd73312cec SHA-256: 3fcd11844f19e03f81e6dbc4cb89a6654811beded3093e1a665670416765b8ce
126 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs, including one that appears to be a search result lure for 'causes of abnormal uterine bleeding pdf'. The PDF also functions as a link farm, directing users to various disposable domains, suggesting a phishing or scamming attempt. No scripts were extracted, but the presence of multiple external links indicates an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/award?keyword=causes+of+abnormal+uterine+bleeding+pdf PDF link annotation
    • http://jirafka.space/19183435197md8j.pdfIn PDF document text
    • http://bella24.xyz/febavoopvki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381788/normal_5feb5af61373d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413112/normal_5ffcbf5e22810.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/97618370245vb17o.pdfIn PDF document text
    • http://marketitaly.info/xidopedepakawexibakzjq7i.pdfIn PDF document text
    • http://easycreditscore.info/how_to_make_an_emotional_poemiml0u.pdfIn PDF document text
    • http://originalhallyu.com/dell_2405fpw_repair_manualoh1bv.pdfIn PDF document text
    • http://classkaod.ru/zanebinilasevetikok56rca.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/dexexetemitemodadaw.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/traffic_speed_racer_project3112u.pdfIn PDF document text
    • http://apsmall.space/carrera_slot_cars_sets1e6lw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452169/normal_5fde67fd24399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_60130c86dce6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusababi.onlinewebshop.net/voiced_and_voiceless_sounds_chart.pdfIn PDF document text
    • http://molujafit.atwebpages.com/92245228661.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_e958929a1876407aa1eebbc1c54c2890.pdf?index=trueIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_aaf0e5fd505849ba8bbd302825c7745a.pdf?index=trueIn 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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 5404 bytes
SHA-256: f42cb2ebcecc8099b380135302bf76b590c5d2e4511edf7890828c2264abb058
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 11068 bytes
SHA-256: c67626a877efeda10b01789af7a8e407f1e4adce34abec4b8c55d1f349653d8e

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