Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f13046b61cb9e1d…

MALICIOUS

PDF

76.0 KB Created: 2021-02-24 07:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d67ff3788e12f5698019d896b0ae8d25 SHA-1: a043e1457e46d4ce91cb48b4ff371174e31a2798 SHA-256: 6f13046b61cb9e1d418b0cad632ae7bde005efae25b3916936e3709aa4dada91
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It embeds external URIs, notably one pointing to 'jottigo.ru' with a search term related to factory resetting a device, suggesting a phishing lure. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=how+to+factory+reset+amazon+fire+tablet+without+password PDF link annotation
    • http://douchehq.xyz/6467094350423fu6.pdfIn PDF document text
    • http://persequenteamsohbet.com/new_vegas_schematics_billboardj38qa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_5fd8bf3160629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_601968d915897.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/cV8eDig/beribodegi.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/hfgijaZ/surgery_master_game_spleen_removal.pdfIn PDF document text
    • http://extraterrestrials.space/91995962220zk99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393488/normal_5fef0be81e0b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5fcd53c2aa3f5.pdfIn PDF document text
    • http://autokenn.com/25049688458veeeo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lotibabakuj/60304869950.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/top_10_puzzle_games_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/age_of_adaline_subtitles_english.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 5620 bytes
SHA-256: cdfff9b22a23af28ac36d6bd80b10b77f0a4a325438055213c412525829e26dc
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 10588 bytes
SHA-256: 38436e63542a57292d3d0360e9a06d56ec45bc58da4a67b3463d4e697aa6938d
font_02_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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