Malicious PDF — malware analysis report

Static analysis result for SHA-256 f235c955bcc16f9b…

MALICIOUS

PDF

67.1 KB Created: 2021-02-17 07:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 87c9b0a4e7a622765cf667c6d9e7a986 SHA-1: 0aaccd6f8aa84cf23f869ea509ba780b03bc14fa SHA-256: f235c955bcc16f9b3d4dde36c10bd151cde81c39579ad1f91010fccd95ea434b
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 ClamAV and 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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=sisterhood+sorority+quotes PDF link annotation
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/2391045.pdfIn PDF document text
    • http://mnclassis.org/telkom_call_answer_user_guidegx60n.pdfIn PDF document text
    • https://popuverixi.weebly.com/uploads/1/3/1/4/131438274/30b7a4033f523.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/7359961.pdfIn PDF document text
    • http://instacopyrightcenter.com/salman_rushdie_satanic_verses_amazon0bhx4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc9eb852b27f.pdfIn PDF document text
    • http://logoped-samara.ru/resonance_inorganic_chemistry3o8tu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_5fd393f05f3c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471948/normal_5fdec5c087fe7.pdfIn PDF document text
    • http://frankiearvelo.com/bazel_0._15z6wa9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_6006107874b40.pdfIn PDF document text
    • http://kefets.xyz/vutawurulolo885b.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/xakusineba/xfinity_x1_dvr_box_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/battle_royale_games_free_pc.pdfIn PDF document text
    • http://fejiremow.epizy.com/zexifofezix.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_off0000cb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 5004 bytes
SHA-256: ab5108a780f13702e8bc495f485615f54ea078895fecda6081736a7ed0680174
font_01_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 10380 bytes
SHA-256: 01e65e561ba9cf6faed3ff57f16db8c4cdf6a7f0545df450b57dbf984510b413

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