Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d507b5f4f28da37…

MALICIOUS

PDF

93.2 KB Created: 2020-12-17 23:50:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ef68b09b04460733afe47e46437f3082 SHA-1: 2a48ad547c58df7eb5338948b4fbe9cb79374357 SHA-256: 6d507b5f4f28da371904325aa09f29f0ce6d4be0ea00082333066c2b8fc6b262
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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://trafffi.ru/strik?utm_term=d%2526d+5e+sheep PDF link annotation
    • https://keminugugenoxag.weebly.com/uploads/1/3/4/3/134321568/7200821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5fd9d81f6360f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_5fbc28f87caf4.pdfIn PDF document text
    • https://wopedibim.weebly.com/uploads/1/3/4/5/134585971/5456470.pdfIn PDF document text
    • https://gogesatita.weebly.com/uploads/1/3/4/3/134321397/1575095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_5fb6a3373bdb1.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/molefogab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_5fc351ee60f82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5a88b8787e879898c667c/t/5fd71eac491a58544a29eadf/1607933614314/how_to_shock_a_well_for_coliform.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/rulugalutulenimebu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f8f692c50b1a1e77efcd/t/5fca4294414f5e352385e07b/1607090838236/play_free_slot_machines_no_download_or_registration.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/jolisatikip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d74422-1415-4d0c-85e9-7a2464f8fdd9/hayward_aqua_rite_diagnostics_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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00015617.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15617 6504 bytes
SHA-256: 24360cdb7014ada8aa5e6f1d3277a2d71ef7b6d1dc3bf288ea9a040c472e669a
font_00_sfnt_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 7516 bytes
SHA-256: 075fb9e944568478c94e38805233b1125798969703103af32602e568e806d8e3
font_01_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 3148 bytes
SHA-256: a277baa0363301820e691350cb860598f83a55ab5f470b69e31f1ace31f899c5
font_02_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 4156 bytes
SHA-256: 3c306e0ec94285d13e87c04bb9d91e20e74eae243bb960c666b01ded030faf74
font_03_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 6280 bytes
SHA-256: 9b26e63dddb061148d2096f8a3abd9ddbfbe7663dcfe2e6edc24d1b84c1ba01d
font_04_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 16032 bytes
SHA-256: 199a1ecfb4c596d0bee30f95a70c02e6be07266173cdadf5d56ff901e6379642
font_05_sfnt_off00013f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2B 16620 bytes
SHA-256: 0463b43a3112d3d6e656d5cb9e84eb721e36d5948e6def5e9336503bf13bad04

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