Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edf098c9bb83b9d…

MALICIOUS

PDF

41.6 KB Created: 2020-11-08 14:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2712d719721603280d69eabe7149e396 SHA-1: e4711bfb4e577fde6323730f348e187876293db7 SHA-256: 6edf098c9bb83b9d75d576a8208290f84f295c60d6dc37ace7e1fd6507c8070c
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs, one of which, 'https://traffset.ru/aws?keyword=fdle+test+study+guide', is flagged as an external URI. The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'Fdle test study guide'. The presence of multiple links and the ML classifier's high confidence score suggest a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffset.ru/aws?keyword=fdle+test+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380528/normal_5f8b33e7024fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f8735f4d717b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5f90ed1de0003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f922df61174b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_5f968b2edbdf7.pdfIn PDF document text
    • https://kepelawurolunuz.weebly.com/uploads/1/3/4/0/134017158/d61c6.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/5341355.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/78fb9c4d-87e8-4892-b769-1b80585ae9db/sound_blaster_z_pcie_gaming_sound_card_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/jokarakibegaragazij.pdfIn PDF document text
    • https://maxetofej.files.wordpress.com/2020/11/the_imposters_handbook_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/astm_a532_free_download.pdfIn PDF document text
    • https://rotadenig.files.wordpress.com/2020/11/82236523173.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/32181233741.pdfIn PDF document text
    • https://gekogekew.files.wordpress.com/2020/11/54706406039.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/wbs_dictionary_pmi.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_off00006548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6548 4744 bytes
SHA-256: fe86241ffaea6e18d1de8d7877f799d1dc113a2c0162db0a871daf01be7abae2
font_01_sfnt_off00007590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7590 10044 bytes
SHA-256: e2767b34a49f5b688fd0f08ce258829c1c93a8f84b9f0bf2bdf10c54d067051c

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