Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14384bdca1a7f28…

MALICIOUS

PDF

31.9 KB Created: 2020-11-09 07:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fc285fa3f50703255635b8c8eab9268f SHA-1: dda802d5a930e0d81914605037d39b64cb120c9c SHA-256: c14384bdca1a7f28e43c9ab4cc5992b0b4192e21b04b4eb428e5fa12a189c774
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafffe.ru/123?keyword=dryer+manual+pdf PDF link annotation
    • https://seroselek.weebly.com/uploads/1/3/4/6/134636573/xakelexa-ranirenizawiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f920a00d2129.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/bunapokelamepoga.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/mizovesopeva_vadilijo_dipagofabirab.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/mukuneni.pdfIn PDF document text
    • https://lowisaxov.weebly.com/uploads/1/3/4/3/134361609/gesuma.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/c64aa9a669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5f8b30807d3ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67bb70a-0ee9-462a-b67a-453b76ffc018/xugotuloman.pdfIn PDF document text
    • https://bipudez899175850.files.wordpress.com/2020/11/smiley_2012_full_movie_sub_indo.pdfIn PDF document text
    • https://miwefonumavo939722521.files.wordpress.com/2020/11/wariwironanedapovibadum.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_off00004583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4583 5112 bytes
SHA-256: 5ffa208e87f237ec6092806f6a9b57533e859e4a5bcf2b1959eedb71c643f893
font_01_sfnt_off000056db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56DB 8244 bytes
SHA-256: f990e4ca7c1491103de90b517289195ec6aab96745a0d685e7aead9f504294a1

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