Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd3de6f51918ac2…

MALICIOUS

PDF

65.2 KB Created: 2021-01-10 08:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fc2e1cb22e3cec4e508f47c6b88086f8 SHA-1: 9b3e7dc1f7defc6405c996602811723c534ee61b SHA-256: ecd3de6f51918ac25ab6a7b9fbc0afcdba913ebf7e3781734446d62cc1ea3eec
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external links and the PDF structure itself indicate an attempt to lead the user to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://trafftec.ru/aws?utm_term=tecnologias+de+la+informacion+espe PDF link annotation
    • https://site-1172123.mozfiles.com/files/1172123/bemolikewafobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5fa7d8f55637c.pdfIn PDF document text
    • https://site-1172915.mozfiles.com/files/1172915/59943426518.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/e7eb1cebf.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/kogerapigosu.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/9shhgeI/best_music_player_windows_phone_10.pdfIn PDF document text
    • https://kaxutaxi.weebly.com/uploads/1/3/4/3/134387751/rimukufifurav.pdfIn PDF document text
    • https://site-1178112.mozfiles.com/files/1178112/76041633111.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/febopa/ultimate_sonic_flash_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/92659546454.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_off0000bd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 5424 bytes
SHA-256: 4a3fc1ee58df445c8d64d9a9a28e97c9596a78b7618ed106409abe025f9d3a10
font_01_sfnt_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 11900 bytes
SHA-256: 1936d75877c1e25e7347277df9b50887051439f43e1225d61f784bb10d68738c

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