Malicious PDF — malware analysis report

Static analysis result for SHA-256 4609727b34b5fa14…

MALICIOUS

PDF

124.5 KB Created: 2021-04-19 05:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6398071b8568ff0ca6def2a6071c060c SHA-1: 74d7218b132e7202ce810beefa38a0ff7bc7cc6b SHA-256: 4609727b34b5fa145c0908ad3ead7f9c5e0011cc5ee6f8f2b11d33261a233ffa
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=what+does+601+mean+slang PDF link annotation
    • http://mazanatur.space/gobuvs99c7.pdfIn PDF document text
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/nemuzotopomo_kevumevoxu_wivijusefi.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://fekabonan.22web.org/jurufuxidesanutedubo.pdfIn PDF document text
    • https://dulupuwo.weebly.com/uploads/1/3/5/3/135393712/mizovarolizo.pdfIn PDF document text
    • http://strapslap.online/koruxivusugeveguspz4t.pdfIn PDF document text
    • http://pmaider.com/nogasazdub.pdfIn PDF document text
    • http://8gusevshop.website/retail_marketing_strategy_templatetej11.pdfIn PDF document text
    • http://bizitegule.22web.org/cablage_automate_programmable_industriel.pdfIn PDF document text
    • http://topcreditcheck.info/mivizujaselevufamanoda2b65c.pdfIn PDF document text
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/komokelitifelija.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/legatusifefe.pdfIn PDF document text
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/segafifevodu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikukuvikato.myartsonline.com/adobe_illustrator_transparent_background.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_680fa506f8224517ae78945171cc07b1.pdf?index=trueIn PDF document text
    • http://wesufonezis.epizy.com/frases_mas_comunes_en_ingles_y_su_pronunciacion.pdfIn PDF document text
    • http://mafolizol.rf.gd/13371248271.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_49b97ad451324af0933b9d5b1b30940c.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_67f095772c9f459dab2e10faabd7dbcb.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_2654234a3e1b45ed9d347068e4409db6.pdf?index=trueIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_acf7bc735513494bba6477a8a7c54cf1.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_off0001ae66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE66 5504 bytes
SHA-256: 0c2f37059fe2c6352dcff35d90c684f9a0913f05d1554cf29df6a6b1303ac7c6
font_01_sfnt_off0001c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C107 10408 bytes
SHA-256: 0267ff8776c987f211e9c19aa46cfa87fe2e9b2f227fd4bbce170f37255b9b74

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