Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16a5cd8daac9061…

MALICIOUS

PDF

89.8 KB Created: 2021-03-17 19:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8c02c51e6e85e6905d01e6e32dc27d9d SHA-1: aeff342d9edf87380976e2c16578abb0e3d6b66e SHA-256: e16a5cd8daac90614e0cb352edfe70a8e53496baeb94ca105b08b5f1a2fad151
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/award?keyword=the+all+sufficient+god+sermon+pdf PDF link annotation
    • https://berajuvexoru.weebly.com/uploads/1/3/1/8/131860787/9838d4e7e.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/9196736.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/canon_pixma_mx432_change_ink_cartridge.pdfIn PDF document text
    • https://moniraje.weebly.com/uploads/1/3/1/4/131438162/venuwuwe_telugixezeg_rutot_besifobonexo.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/2235426.pdfIn PDF document text
    • http://xifutipixa.mywebcommunity.org/wijusixipagugijujik.pdfIn PDF document text
    • https://lezanaxowap.weebly.com/uploads/1/3/2/6/132696506/dolosak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_791f1f9b100e4084ae75f36bf1106654.pdf?index=trueIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_eb8322f8530a408fa4d289bccfabdcba.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_fb74bf4b6041487090637930d20a23b3.pdf?index=trueIn PDF document text
    • http://vebusatoro.atwebpages.com/ganik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8bf56f-8097-401f-b1af-138ecb94b6e4/83167151773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81e3b2c-468f-45c9-a7e6-bf9de685179b/58428135530.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_001d6ecac93b48a39099db13e1333f94.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a5f2b4-2796-4624-b5d6-f95826318b45/41450165610.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_16672fd4afe34d63a0a0f7183da1ad52.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_a2b477fce5b94e83b1cdd39188cfb00d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ea0f9e-fa5e-498c-9d7a-fdd33d43afaf/2002_rsx_service_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 5516 bytes
SHA-256: f696201b3c4c4eac00d775690d91ea17f46669ef5e3a9d9a436c8feb54b39f8d
font_01_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 11108 bytes
SHA-256: b8935907f4b7419d74ae4880ceacbe9e453498cf2ad08b209b2ce51690d58f1d
font_02_sfnt_off00014527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14527 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d