Malicious PDF — malware analysis report

Static analysis result for SHA-256 0830912619676c2a…

MALICIOUS

PDF

64.9 KB Created: 2021-02-20 02:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 03f41c00dfdf02c4bbbe13f700998f69 SHA-1: 1b970bfefc3795af788370667f7e289c6c3972cb SHA-256: 0830912619676c2a284600475b682c6b5f8a72274ef8ec6a84561a0214bc2f37
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=aircraft+maintenance+technician+salary+in+dubai PDF link annotation
    • https://cdn.sqhk.co/seseniluvus/bURUge7/fun_literacy_games_online.pdfIn PDF document text
    • https://tunuwowidu.weebly.com/uploads/1/3/4/6/134606858/777fb40afbc738.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/jfihhh3/hockey_training_program_free.pdfIn PDF document text
    • https://meloxatug.weebly.com/uploads/1/3/0/9/130969811/lixanidirewojumiva.pdfIn PDF document text
    • https://panikudar.weebly.com/uploads/1/3/1/4/131437701/d681548269d.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/cI2e1rw/free_wallpaper_for_cyberpunk_2077_phone.pdfIn PDF document text
    • https://mowerezudajam.weebly.com/uploads/1/3/5/9/135966589/1017208.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/ihahhhi/strike_force_kitty_2_artifacts_11.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/seljc4d/juvituvelonako.pdfIn PDF document text
    • https://totibevopomuv.weebly.com/uploads/1/3/0/8/130813722/e0534.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/6890098.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wujawejibizub.epizy.com/bully_kutta_image.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC179 5492 bytes
SHA-256: 0858992e2fe2d75d315f7218550289860b29109590625f20bd4d418858467cdf
font_01_sfnt_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 10060 bytes
SHA-256: 75d925aa8b748b651c950b70cd1bcc27e5d90bc855395f511b8bc5a26cf7d665

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