Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cc6d4cce65661c…

MALICIOUS

PDF

84.8 KB Created: 2021-03-22 21:33:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0e23d6108f72c8ea095257e58a17a2e SHA-1: 7b6e9302a24445ffe58f48931a9202c4919ac8f7 SHA-256: 08cc6d4cce65661c90e0e6499338dab6f554339f24b6b5958db48d57427da8fc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through the linked content. No scripts were extracted, but the sheer volume of external links points to a coordinated effort to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/wix?keyword=lone+star+tennis+tournament
    • https://limowidijepa.weebly.com/uploads/1/3/5/9/135992559/xixirilun.pdf
    • https://dopesitelubi.weebly.com/uploads/1/3/5/3/135307477/9188479.pdf
    • http://ronifibofizet.medianewsonline.com/divopasub.pdf
    • http://sewakasatixori.medianewsonline.com/28926541588.pdf
    • http://wegoradubi.sportsontheweb.net/astm_a537_class_1.pdf
    • http://venolilixe.mygamesonline.org/bacon_s_essays_download.pdf
    • http://toworugesolur.getenjoyment.net/jspdf_autotable_font_style.pdf
    • https://tuduzijusesuzi.weebly.com/uploads/1/3/1/4/131406801/27451.pdf
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/8982841.pdf
    • https://nejaxadutoxukax.weebly.com/uploads/1/3/4/6/134622523/9455011.pdf
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/2459448.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dopovis.myartsonline.com/dewalt_d55168_pressure_regulator.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_878af628c961430bb94fad533f947378.pdf?index=true
    • https://s3.amazonaws.com/teximikamukubo/what_is_centrifugal_force_explain_with_example.pdf
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_404682d3b7884db08c294a73f7b37e1c.pdf?index=true
    • https://s3.amazonaws.com/jezobasit/means_of_transport_worksheet_for_grade_3.pdf
    • http://taroveruwidiba.onlinewebshop.net/12325471740.pdf
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_283858c22bf94b08b90240012a701355.pdf?index=true
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_40ac1668834648208c1cfb5d1f7356ae.pdf?index=true
    • https://s3.amazonaws.com/nigimul/the_secret_life_of_bees_full_movie_free_online_123movies.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feea.bin
11bdf476cd397ff9bc833ac3ae841dfde49053bfa5f0759da83700e1edd29d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 4620 bytes
font_01_sfnt_off00010e82.bin
29e533a9555bf2318d623df256bd486f88da6832938357f4276d4f8939dc39ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 11668 bytes
font_02_sfnt_off0001364a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1364A 4324 bytes

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