Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8cfd2b646a241e…

MALICIOUS

PDF

75.9 KB Created: 2021-04-01 00:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 643630a44f5d2eda5b18880bb9bc99d9 SHA-1: 69112cfc631be0e7ce095949091a303eb9b4c9b3 SHA-256: fd8cfd2b646a241ea98d18df7959c2774cf9bbe6170c4dfef9a18b1862cdba2c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

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://druttle.ru/123?utm_term=bell+bottom+trouser+cutting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487927/normal_605980c06e542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_60245856bfb9a.pdfIn PDF document text
    • https://vapomawuwe.weebly.com/uploads/1/3/1/3/131398268/kuduwobipoda_buwebixejorutab.pdfIn PDF document text
    • http://mefomizus.22web.org/poulan_chainsaw_p3416_price.pdfIn PDF document text
    • http://tizezs.xyz/xupiraxewojubetozananba7xi.pdfIn PDF document text
    • https://nimudizovif.weebly.com/uploads/1/3/4/4/134478886/5613097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404512/normal_60314036bc157.pdfIn PDF document text
    • https://fetezubusob.weebly.com/uploads/1/3/2/6/132681625/5cb829b.pdfIn PDF document text
    • http://pepipawupex.22web.org/51810544044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_6064e3a3491aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367310/normal_5fed9cb1707d8.pdfIn PDF document text
    • http://sedijonowet.iblogger.org/vodovuvidegifet.pdfIn PDF document text
    • http://dizotegi.iblogger.org/14538356896.pdfIn PDF document text
    • http://myirn.icu/gomavavebesojaped3p13v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ca5e1f-a3d2-401d-82dc-687e31d3aa46/15435982797.pdfIn PDF document text
    • http://kitefalorur.epizy.com/bogukudibolel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0524da43-b570-4267-8cb8-3b8a47ba6598/icewind_dale_heart_of_winter_walkthrough_gamebanshee.pdfIn PDF document text
    • http://pikimavijepe.epizy.com/circular_110_cysec.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_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 5096 bytes
SHA-256: 10065a54ee7d320f895954c13e415b7797d01a9093f6c2c51af58be0ea5f9515
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 10752 bytes
SHA-256: 5ed132850d9c1ae85f4bf0c7ade0f2bedbfeca4ef54a13535e0fe2882ab782f7

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