Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26d9826773b47a1…

MALICIOUS

PDF

78.9 KB Created: 2021-02-19 08:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cb9f5e2bff75e3f00f3ae4118d8b8e39 SHA-1: d4b3b1c4d4dc649edcfd0139a7a5b3bf8d6b0f05 SHA-256: b26d9826773b47a1d82aae992f1a6ba7ae36ab7974e7ecc605546498ed93b130
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=harby+junior+high+basketball PDF link annotation
    • https://bonorira.weebly.com/uploads/1/3/5/3/135346760/6634474.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/cjfihh5/95016122246.pdfIn PDF document text
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/xogawutoworawuv.pdfIn PDF document text
    • http://pc-remont.website/enerpac_catalogo_prodottikv9zy.pdfIn PDF document text
    • http://legrand-spb.ru/b._sc_nursing_online_form_2019xgxak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5fd68a064d343.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/jgijSiL/exploration_definition_and_pronunciation_of_cairn.pdfIn PDF document text
    • http://healsmall.space/170616697996955n.pdfIn PDF document text
    • http://musc-media.xyz/20400343521co7i6.pdfIn PDF document text
    • https://cdn.sqhk.co/naforokafe/i1Yhcam/65393801957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_602e24b0a556e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_60082e3cb0dd5.pdfIn PDF document text
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/3ba0aed.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/zarelusipofox/xudumukegetegetuloge.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/70802886483.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_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 5292 bytes
SHA-256: c631ba065fba4327a03dc0dcda787153777288263996d960226a5ab833bcbbd1
font_01_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 14400 bytes
SHA-256: 09f7e3fa499748b60f561f6184383c5dfdd29be333f33625dd8674027c1e03e1

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