Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8beb16068dbdcd3…

MALICIOUS

PDF

88.9 KB Created: 2021-03-14 03:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a260080bbdb0b98a071d30734fbd039e SHA-1: 210f6ea1a843c1993b26de611ddb8359844b2fd2 SHA-256: c8beb16068dbdcd3bfcb8d9f42d7265876ed403c31fd69960d4c0a87df707e66
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://druttle.ru/123?utm_term=boxy+svg+free++mac PDF link annotation
    • http://helpverifybadges.com/83570723742k18k4.pdfIn PDF document text
    • http://tryraisins.club/vufepupel9e.pdfIn PDF document text
    • http://fruitnaturs.space/987431009739u7ke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_604d44e11734a.pdfIn PDF document text
    • http://stebsmeh.space/free_ableton_live_8_trial_versiontru01.pdfIn PDF document text
    • http://kersita.fun/8306595219400dpm.pdfIn PDF document text
    • http://3bureaureport.info/how_to_pair_an_lg_sound_bar5hcg5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_60483411d13b0.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/muvemasoxaji/64197366600.pdfIn PDF document text
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_4b885eedc9924313b49121a0142f0f5a.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_0e2bf8f94da64952a8680ddeb0a45d4a.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_930e19f79f2240a4aa97998bad240a5a.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_f49d5e3830c246af8fcbc76312b6186f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufexa/10283836340.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_337006545da84777bd450154200622bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/patigize.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/18549035574.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_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 5448 bytes
SHA-256: dd50ba8ebea355d9d7a18c8da8617f1699994a99765b5b21e0cc5de0622dc2a5
font_01_sfnt_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 11812 bytes
SHA-256: a7de862ed7cc7038af54aeb75bf7deb22c686bb2f68d9ba92d80df9d05cdf0ca
font_02_sfnt_off000141b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B4 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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