Malicious PDF — malware analysis report

Static analysis result for SHA-256 672ced44007538c5…

MALICIOUS

PDF

76.3 KB Created: 2021-04-02 03:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1dc970c748feef2f7e2cc89707436bca SHA-1: d4877b3ad55eca601ed29a971e97f548781a5be1 SHA-256: 672ced44007538c5331634f1e0c9fc74bb422b62171e1154953e423a5a8fbe7e
126 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 hosted on disposable domains, suggesting it is part of a link farm or SEO scam. The ML classifier strongly indicated maliciousness, and the embedded URLs point to suspicious domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://xezojetit.ru/wix?keyword=unit+10+choosing+the+right+word+level+b PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459326/normal_6036a087e5f37.pdfIn PDF document text
    • https://wowavimisaken.weebly.com/uploads/1/3/0/8/130814021/nugosele-kunosix-lutegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_602a77e072d89.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/ghLmhdY/vande_mataram_ringtone_ar_rahman.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/jhEhgtX/13418905844.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/muzizofe-gawalulegusiw-lufigebegoxexom-wemenafitevo.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/jdEicjg/41715510010.pdfIn PDF document text
    • https://wexejapu.weebly.com/uploads/1/3/1/3/131384175/3157796.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/6f61c05d564a71b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_5fda477f01bf0.pdfIn PDF document text
    • https://duzozerijadid.weebly.com/uploads/1/3/4/4/134493401/lodujaf_zusasa_paremoweperobus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_602d08c722fac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_175ee4df28834544a1c36942f8e84e8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejeseja/ludobinutoximumavoxu.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_332d34c2a4d84396848e5bed2a51aef9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/38718379548.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_efaeab3c331045bca80f01ce64bdb001.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petubapizo/2017_telugu_movies_in_tamilrockers.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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 5468 bytes
SHA-256: d1c660450a2ca9c451fe56b2e8f732012e8f104f01b2ae55dd5ce4b8bea80bf5
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 11348 bytes
SHA-256: 1cbb3b0eb2d2d0233d57990cb3c2cc3f062fb58472a46fc4d400dcb34516ad22

Open this report in the interactive analyzer, or submit your own file for analysis.