Malicious PDF — malware analysis report

Static analysis result for SHA-256 246079697ca8f3b2…

MALICIOUS

PDF

76.8 KB Created: 2021-02-16 05:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 873d8e0949269cb13477f501ff6f9fea SHA-1: 4ffb74ceacb3e8eba94d23d132ffc1e601fd53a3 SHA-256: 246079697ca8f3b2fec4c6a66e5130107706250c48e5e1094b345d48b3d2c312
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains multiple external URIs, with one pointing to a suspicious domain ('druttle.ru') that is likely used for phishing or malware distribution. The presence of a link farm on disposable hosting further supports a malicious intent. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or downloader lure.

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://druttle.ru/strik?utm_term=the+mysteries+of+udolpho PDF link annotation
    • https://cdn.sqhk.co/texivewa/gcy8jj6/started_from_the_bottom_clean.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/tgj8BQo/funny_but_clean_youtube_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/kowukogifaw/bjNVHh3/80319123750.pdfIn PDF document text
    • http://vinnipoh.fun/ludulewowopiluxujuwogac6xb5.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/ejgclic/call_recorder_hide_app_cloud_backup.pdfIn PDF document text
    • http://gododerur.66ghz.com/harry_potter_6_sinhala_subtitles.pdfIn PDF document text
    • http://50off.pro/asrock_easy_driver_installeru2y76.pdfIn PDF document text
    • http://foxareb.22web.org/xizewoluroriwikawe.pdfIn PDF document text
    • http://espaceabonnes.com/79944493909uf4k5.pdfIn PDF document text
    • http://naturka.space/kuzifiblgwzw.pdfIn PDF document text
    • http://good-production16.site/aiag_cqi-20t7oc4.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/rieOeij/kipikupipuga.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxobenona/bUvghL9/jabudoke.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://lokuvutifinulef.rf.gd/free_rehearsal_dinner_invitation_templates_printable.pdfIn PDF document text
    • http://renodiwug.epizy.com/scream_go_hero_eighth_note.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/mitutoyo_micrometer_calibration_procedure.pdfIn PDF document text
    • http://feruzituxiruz.rf.gd/wokipimiluzi.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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 4896 bytes
SHA-256: 4267f33c60cf896e7fffac158d4475534cc8fb095aa59b426ff0392e0aca931c
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 10224 bytes
SHA-256: 91c2dd945392962d36d508729f2611375cb5ad64123bb1904562e55a8538a04b
font_02_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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