Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6106d1c94b0d7bf…

MALICIOUS

PDF

76.7 KB Created: 2021-02-20 07:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 12479834db287126ac343d47ed638018 SHA-1: 2212a3cf95492d439eb76321c91142fd7bdf8060 SHA-256: f6106d1c94b0d7bffc1ce20fe9d60db6be519860a376563f79f6babda331d7e6
134 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains keywords related to 'gas relief and prevention' and is likely a lure to entice users to click on embedded links. The presence of numerous links to disposable hosting and link farms suggests a phishing or malware distribution campaign.

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://jacksth.ru/wix?keyword=equate+gas+relief+and+prevention PDF link annotation
    • http://artdebug.site/38853479153dfzzy.pdfIn PDF document text
    • http://mini-cam1.club/fusogaweqt9om.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/68435.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_5ff46926410dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_5fd5fd80c79f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496193/normal_5ffbd87b3f95e.pdfIn PDF document text
    • https://datevasipagudi.weebly.com/uploads/1/3/0/8/130874205/8876432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_601e2d992636f.pdfIn PDF document text
    • http://petrol-v-pol-price.site/math_worksheets_adding_and_subtracting_negative_integerswlwmq.pdfIn PDF document text
    • http://videohost.space/demande_report_audience_tribunal_instance6etmh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5fd65324ac66a.pdfIn PDF document text
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/sibuwuviv-zebafumip-pilizo.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/zukogi/heavy_metal_pro_battletech.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/kuwugekilewizuweravoki.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/vokakenik.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/edelweiss_sheet_music_piano_free.pdfIn PDF document text
    • http://morufigalolo.rf.gd/19602535177.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_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 5352 bytes
SHA-256: 2614cc6b99d7199ffeb7aa191b62aaf7b2f6cbb27d26458445d2e189771bfb9e
font_01_sfnt_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 10492 bytes
SHA-256: d15d0b9358c70b057d83b20a6d0b15681a8e5b6153d73bfefd9838ffbf0cf29f

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