Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed27618ff1965f59…

MALICIOUS

PDF

77.1 KB Created: 2021-06-02 14:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 833bb2e4c1cf9fede32035972a4f3eb2 SHA-1: 1691e47c9b8e4ebfc404fd19f101a66dd3a2525f SHA-256: ed27618ff1965f591bc6c02b04da34c4615a0e986fa3617da5dbc3c4f71799d9
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=flexera+software+llc PDF link annotation
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/monim-rebotifenabir-tusila.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444657/normal_5fe24093a28a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403808/normal_5ff11da270531.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4502178/normal_60b0acdc72530.pdfIn PDF document text
    • https://dudepemak.weebly.com/uploads/1/3/4/7/134702006/3798740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pazimonofe.pbworks.com/f/black_swan_green_quotes_page_numbers.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/w/file/fetch/144477933/6027417373.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/short_stories_based_on_thirukkural_in_tamil.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144426015/47374330852.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144427158/yaris_2007_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66b528c-1245-40a7-af80-f0ea6d3d5afa/computer_and_software_repair_near_me.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/liriketinegajolurexoduta.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/f/ffg_star_wars_rpg_talent_trees.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/75050797303.pdfIn PDF document text
    • http://zegugas.pbworks.com/f/tupapuf.pdfIn PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/144498369/18564163272.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/w/file/fetch/144499428/spanish_preterite_tense_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66304959-77c7-4365-a7e4-26ec1c595de4/beat_the_market_maker.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_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 4992 bytes
SHA-256: d00bcf8795a980e3d5e7cdecbf2e498fb8bbd58d3b3562c49807c2684f1364d1
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 11696 bytes
SHA-256: 2b11224128e8ccfc11cec8fa0673f13a5e4bcde4a977718ed0fd2dd623db11d6

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