Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eb127fb8f3a666…

MALICIOUS

PDF

93.9 KB Created: 2021-02-23 01:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d86e9006327da0aa68606cf6b28f67b SHA-1: 928045cd5550b2ec07bf6dada8033bdef30dfae8 SHA-256: d5eb127fb8f3a666ea676c965f2a3d758c6a8c15b1989a36037fd6b79e3438a7
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 0.9997

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://maypoin.ru/strik?utm_term=cisco+8742+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486743/normal_6032bab322e9e.pdfIn PDF document text
    • http://citruss.space/how_to_calculate_enlargement_scale_factorj7g4w.pdfIn PDF document text
    • http://chambrely.xyz/guvuxitudevolurgx3h7.pdfIn PDF document text
    • http://blekrossi.ru/87869610650w23y0.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/2627350.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/f3c8f7af5ff.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/hd0ROsr/pupow.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/geBLhgm/simcity_buildit_hack_tool_without_human_verification.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385633/normal_5fe5a8e56e2b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5ff4011ec06e8.pdfIn PDF document text
    • http://mamajan.space/how_to_put_sim_card_in_samsung_a10_phonedbhyc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_60343ace53e6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5ff8d8b209a77.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/tubukeganuji/dobuwotedapusazataweba.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013fbd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13FBD 23304 bytes
SHA-256: c5288ee2174a5a374223e1ad5bb604bb99cfbda4c3940db47f91c45a99ed47ac
font_00_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 5248 bytes
SHA-256: a0331975c7b3bc5ab37f1f111b9d9351106d6bed6c548c6c38f8dad0062872b5
font_01_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 14612 bytes
SHA-256: b4007d2a6c9c27d18434311490c1ee0e571a1f62ed17af93376d9ea9dfb835bc

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