Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9240ad6832faed2…

MALICIOUS

PDF

75.8 KB Created: 2021-02-20 19:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c956252aef9123bc7d81af5f50d1a713 SHA-1: b54d2a48007caa0d135c770e00f1b70898c4d66a SHA-256: f9240ad6832faed2345ad29e11e50a035a94fef96b29bc3eadef815d27678e5b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'https://jacksth.ru/strik?utm_term=how+to+use+obd2+scanner+bluetooth'. This heuristic, combined with ML and ClamAV detections, strongly indicates malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain metadata related to the URL's theme, reinforcing the lure.

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://jacksth.ru/strik?utm_term=how+to+use+obd2+scanner+bluetooth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370767/normal_602d7bb7425e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5feda3fe458b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5fe8656f6b2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_602ab3e9aaf38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_6021c4e10d3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_601d224382566.pdfIn PDF document text
    • https://leliwigozamik.weebly.com/uploads/1/3/0/7/130738568/varidufob-kufofi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383698/normal_5fec6c960c949.pdfIn PDF document text
    • https://pazivumamitobe.weebly.com/uploads/1/3/0/7/130739218/1368134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fd8e03f961e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://melamepapate.rf.gd/adobe_audition_3_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/microsoft_powerpoint_jeopardy_game_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/93839875126.pdfIn PDF document text
    • http://tewidunutazi.rf.gd/67818067157.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/awadhesh_premi_ka_video_hd.pdfIn PDF document text
    • http://loxabireja.rf.gd/bcci_full_form_ki.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_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 5352 bytes
SHA-256: fdcea1ea840a2b3be7ebfa3ec8600400adcdd113b57d3c3c12133bb43b76c9ca
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 10168 bytes
SHA-256: b9bce9926dc04a184ead75e281cd83fe515afd3db03416e2f2194ef4642c7fda

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