Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bc8c9dd11a521e…

MALICIOUS

PDF

90.1 KB Created: 2021-03-25 06:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9612d8977cd7801d9e13a6d1acc272b3 SHA-1: a594340348cf270be5e574aa132c55662f01eed3 SHA-256: 75bc8c9dd11a521e7921f509e4b46bc4813d7e9fc7eca3e0ac9ce0e55e811fb0
186 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to direct users to various external websites, masquerading as news related to "tangedco bill payment". The PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate a deliberate effort to create a network of links on potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=tangedco+bill+payment+news PDF link annotation
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/jibujilinopek.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/xrjjO4J/wasagalofimitasawijesumel.pdfIn PDF document text
    • https://gafojeted.weebly.com/uploads/1/3/1/4/131452963/mutevipodorasowogaga.pdfIn PDF document text
    • https://cdn.sqhk.co/nakizenonetu/eiiYYnM/froggers_oviedo_delivery.pdfIn PDF document text
    • https://zixamagexiwu.weebly.com/uploads/1/3/4/0/134012381/73530.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/3b2c2ac.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/ihea7ii/pefus.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/gusuk-neraxarazesoji-zekidoliwafoba.pdfIn PDF document text
    • https://cdn.sqhk.co/worekoxe/giplwux/dobekugidopexobiwubi.pdfIn PDF document text
    • https://petobaxiteru.weebly.com/uploads/1/3/1/4/131407236/2218068.pdfIn PDF document text
    • https://dugaposiga.weebly.com/uploads/1/3/4/8/134857723/taxakada.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/heifJif/joplin_mo_restaurants.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_3f541b7818ff4746b0a2b17d9afd73b8.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_2c9b39a8fd054e7da99e035d3d4bfdb7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/pamadufoxamezetubewitu.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_7edb700dfd9b4c8c8c9fe61390719c42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/methods_of_preparation_of_alkanes.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_d8dcde7c5aca4bb4962c85271f19f969.pdf?index=trueIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_193d36189aea4625abe4a67eb53bd255.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/jasoximiboxavawupanixigi.pdfIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_394c9b0a09e643309f5829d80ccce2b1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 5580 bytes
SHA-256: 1c474f016eff4858b8d2d72030737a1a6347e98d3c704b6ca47f4f5f652316f8
font_01_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 3192 bytes
SHA-256: 08f03a28fd2fe51139b197283a30c2680cff6255f7c8ac86cab9dcec78cfb762
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 11676 bytes
SHA-256: 0ad7e58613d8401d423abbc8c72c879acccf8036495a10ddd6dbc50187a3bbd2
font_03_sfnt_off0001451c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451C 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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