Malicious PDF — malware analysis report

Static analysis result for SHA-256 842b873c911fb476…

MALICIOUS

PDF

80.1 KB Created: 2021-02-12 00:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 77d35d9d46db8d5adf73ce7f66c5aa24 SHA-1: a43257c90b29035122ad40bdd702b7e3b73f3912 SHA-256: 842b873c911fb476df6fd4259ec855f3166eaef7cfe2cf52241f959899befc5a
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/123?utm_term=knowledge+nature+and+normspdf+free+download PDF link annotation
    • https://cdn.sqhk.co/bosamame/dicfXjh/my_talking_tom_friends_game_release_date.pdfIn PDF document text
    • http://tefuzomabi.iblogger.org/horizons_genesis_sheet_music.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/8743309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_5fe80bcee6a9d.pdfIn PDF document text
    • http://funomixukipiv.iblogger.org/laboratory_design_guidelines.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/735428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_60107ee928092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457272/normal_60214d26d9a56.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/hiVjcia/super_zig_zag_world_market.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagonunanu.epizy.com/36995793934.pdfIn PDF document text
    • http://jiwepatifon.rf.gd/54343958668.pdfIn PDF document text
    • http://wujarid.epizy.com/marketing_case_study_template_free.pdfIn PDF document text
    • http://sazosubegus.epizy.com/filowivalorowub.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 5424 bytes
SHA-256: 6b5c60aac60e95f001fc92d81dc31e726df7f7428783564f0a4dd7452b63fc2c
font_01_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 11024 bytes
SHA-256: 10a0b6fb5c001574b9fa5eabacc802e95ec423d9fe9af4c224560a8fd6a362fa
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 16200 bytes
SHA-256: b3d95354fc80a361dd48af21ae6ea2e9afed99d85c2a3657ec3a7d3405962d9f

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