Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1dbe37535d72dd…

MALICIOUS

PDF

53.2 KB Created: 2020-11-05 15:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2828cb269e1fc69aba8a89b807cbb697 SHA-1: 931afb9e7dbc965e576b0479241295c6ce210719 SHA-256: bc1dbe37535d72dd3fe9a18846a7515cca791dab7eaac41098bc0e11e2e8378b
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://trafffe.ru/aws?keyword=managerial+accounting+chapter+3+answers PDF link annotation
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/9382355.pdfIn PDF document text
    • https://pativezakuzorad.weebly.com/uploads/1/3/4/2/134266084/fowaduweduzemapalep.pdfIn PDF document text
    • https://gitojigobireko.weebly.com/uploads/1/3/4/5/134517815/1720608.pdfIn PDF document text
    • https://dabituge.weebly.com/uploads/1/3/4/3/134344098/4100742.pdfIn PDF document text
    • https://palekamenagogu.weebly.com/uploads/1/3/2/6/132682235/941827.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/juvem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_5f95ac50913eb.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/7556dce9-880f-4d5a-94fc-f6dc2a65af1d/45136036625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7b00d0-6d7c-44d7-a8ac-70d3f5724d67/bishop_guertin_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7648cc7-6451-45f4-b87d-a0ead65fff28/zetiwuwerobanex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faabf542-d936-433e-ad70-665ca9600b0f/coad_chevy_anna_illinois.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27609c49-457a-4e9d-a976-9f80a98af268/gidenomuli.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C3 5456 bytes
SHA-256: 2132920dfeb5e98968adeb4834c849efba0281981bb65fa0b70c194e783dc35f
font_01_sfnt_off00008c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6A 10696 bytes
SHA-256: 75eb8e8b13aabdf783d635e0db7658d746043d845ea862f2c8c531544d1b2758
font_02_sfnt_off0000b11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11B 16084 bytes
SHA-256: 62a91fb32920f6e8cc04f0b1e834142448e73e4a31e16512d2a7fd751ba0d286

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