Malicious PDF — malware analysis report

Static analysis result for SHA-256 3817e59e737932bb…

MALICIOUS

PDF

70.8 KB Created: 2021-02-23 06:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8bb7ee6fe2b26d69bfef6eb6c029307e SHA-1: dd3618a6e37896eb95bdb2fd3918d12875429ec0 SHA-256: 3817e59e737932bbfd21a04459c2060310af413f0556aacfa8b1660cbcf0c734
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature.

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=artemis+fowl+the+last+guardian+summary PDF link annotation
    • https://cdn.sqhk.co/fagaxirupunu/fghxha8/mevevozunupinu.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikeraz/Djb6Egh/my_plants_evolution_your_pocket_garden._com.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/b2d40e667bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366964/normal_60084f0ee85e1.pdfIn PDF document text
    • http://panuxidoku.22web.org/77308524919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5fcf2bf883c2b.pdfIn PDF document text
    • https://lopenedaxi.weebly.com/uploads/1/3/1/6/131606218/fezebajijezoporeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5fe2f5976bfdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_6023c0ac50538.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/4223111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5fd0d40a21f59.pdfIn PDF document text
    • http://segepivo.22web.org/blaupunkt_bp_2._0_fhd_instrukcja.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/NicgjSW/modoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaliselisasi.rf.gd/xozebixabafulenila.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/uwc_scholarship_application_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/bounded_sequence.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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 5504 bytes
SHA-256: 831b74796c9608a14981ca20148bd006a24a8ad2a9a2092438200257fe2f138e
font_01_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 10252 bytes
SHA-256: 275f0cf5c73a0d7c1b1cd67417d87a9c7d9f09294ac97de6400eef521d5eab55

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