Malicious PDF — malware analysis report

Static analysis result for SHA-256 943b631835c5d99d…

MALICIOUS

PDF

103.7 KB Created: 2021-02-06 16:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: adfb460b5e48620bbf1fb8f850644845 SHA-1: 7a706ade8a8774bdcba3488d624fedcba3f217e4 SHA-256: 943b631835c5d99dd1f7304264c28420a18882ea01bda178bf90bdd89ecaaa25
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://leonvi.ru/wb?keyword=sim808%20at%20command%20pdf PDF link annotation
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/kujuwube-rurorim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_6014486e9a9b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405186/normal_5fefd0fa51384.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/Tifiiib/bavofigidudebazat.pdfIn PDF document text
    • https://vobanugan.weebly.com/uploads/1/3/5/3/135340106/lufefomebalozo.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/ghghjT1/apple_music_download_stopped_mac.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/xilonefe-pakupapuxevog.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/9d69d755df204.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/8387328.pdfIn PDF document text
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/1dc17.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/hc5ehhz/simple_bowling_release.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369149/normal_5ff55fadc022d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489716/normal_5fedc6b600202.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/4764721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373509/normal_5ffb70b38bb8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_5fd9d45077e19.pdfIn PDF document text
    • https://cdn.sqhk.co/sojejinof/NjeWfji/semawije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/restrictive_and_nonrestrictive_adjective_clauses.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/archicad_gratis_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/77799723832.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/10258555156.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 6588 bytes
SHA-256: 8ea517b2c6266694ce403208306b360f82b97d238dc6773bee785c6d402077af
font_01_sfnt_off0001309b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 5436 bytes
SHA-256: 3ea1a52cb7689e1c7bbe3ecf6cc15e89b1bc78759ecf342b66de56804d5660ee
font_02_sfnt_off00014307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14307 5600 bytes
SHA-256: af0154cd2a322d8d82c0b4b905e49f9f3c036e662eb9b20313c6b725aad31fef
font_03_sfnt_off00015425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15425 11324 bytes
SHA-256: 66633e01418d5944ad78db0280bd5f4d72fa0ba25f0b362af5b77f69c22d6d87
font_04_sfnt_off00017ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE2 16188 bytes
SHA-256: 7c4a0142465a34aad2179791fd7cab893267a8a2df2c0c58d8ad159de1740d48

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