Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d82dd9b1d7c7814…

MALICIOUS

PDF

66.0 KB Created: 2021-03-30 21:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 038ab0b65dacd8c5d610749cdf7598f2 SHA-1: c46ab776919d9e913806c4068d48fcf88ec313f4 SHA-256: 1d82dd9b1d7c7814c727f3aa27a8a79e1239988ae55a8cfadb5a911144030e99
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports the conclusion that this document is designed to redirect users to potentially harmful content or manipulate search engine rankings.

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://seumenha.ru/award?keyword=pygmalion+bernard+shaw+pdf+free+download PDF link annotation
    • http://inglassrus.ru/jam_replay_bluetooth_speaker_instructions9d9rd.pdfIn PDF document text
    • https://zonanasuwovu.weebly.com/uploads/1/3/2/6/132683154/1315906.pdfIn PDF document text
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/0129e067ed5e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_603762ed3ca09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_600f1b51db0ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491673/normal_60057f7198e16.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/mabomozeto-putoxizinujexe-dixufeb.pdfIn PDF document text
    • http://nutristrike-shop.ru/ilive_sound_bar_47_reviewosh7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_6033a80fe63d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416510/normal_5fca0290aa69d.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/343f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_ce39ed7cf77b4ad29c5c178d7c43e918.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_28ee04eadf6e40ce892bd16d1438245e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/analise_swot_livro.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/apc_accountancy_class_12.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/54413391923.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_a121d873fe1b43e1bb4a678f890d5600.pdf?index=trueIn 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_off0000c4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D2 5788 bytes
SHA-256: e64d8b70cf4d9e992ee9171d4af3b2536bd5ee6caf88ed99cd7262f90d5fc649
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 10160 bytes
SHA-256: 6affbb143557fc912836b043da3a86a3ef992056305424bbf38b4a865ac5988c

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