Malicious PDF — malware analysis report

Static analysis result for SHA-256 a937826f58c98fd6…

MALICIOUS

PDF

81.9 KB Created: 2021-03-30 16:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bae30de5c827f2b5e4fe3a144675ca71 SHA-1: 5d3758d7f2ae48a7197059ab2c73082bd88600e0 SHA-256: a937826f58c98fd6f888624acf085a3226a0cb0c87969c607a8d1a887abc79c2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users, likely to a malicious site. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

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://kuzutuzo.ru/aws?utm_term=what+is+a+lancet+needle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375199/normal_605d30aeb53c0.pdfIn PDF document text
    • http://xteenware.online/goxotutufyqa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fcf31c1d8786.pdfIn PDF document text
    • http://itravelgr.com/79715028296v9poc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_603c7f5ead91a.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/igeh8hd/miwujagatif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_6041b6201624c.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/jjLGgdA/world_war_2_videos_history_channel.pdfIn PDF document text
    • http://pay-order.info/solomons_and_fryhle_organic_chemistry_originalvv0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_601674c32659b.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/5sijX1V/card_thief_upgrade_guide.pdfIn PDF document text
    • http://justiciaforjustice.com/25785662927z7a34.pdfIn PDF document text
    • http://anarchymedya.com/32893751732a11ld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_6040e54528de7.pdfIn PDF document text
    • https://cdn.sqhk.co/mejiwimuza/fmIFt7M/slice_food_delivery.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/rubajojiwugumatuvle9vi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_601b5043d9fc4.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
    • 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_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 4620 bytes
SHA-256: 00b0766112afea16996a5dc6cdf8c3010919e0b4f1c964fa9ae3139936cfccf3
font_01_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 11304 bytes
SHA-256: 76aef78d3ec0370c0d0f645695a3d203c0a0437de20b4af5742256cc3e67fc67
font_02_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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