Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05f88ac7fbbdfa6…

MALICIOUS

PDF

81.5 KB Created: 2021-03-31 01:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f003054314d9963b43b530f3649d64ac SHA-1: 506bd845dfecff2287d838e33c498a70fab702bf SHA-256: a05f88ac7fbbdfa6856e0d81ccb17b5dc3963ae112fc19091d20ec785842cbf2
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 0.9992

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://midufefew.ru/award?keyword=celestial+navigation+terms+pdf PDF link annotation
    • http://reduslimitalia-ufficiale.site/bloomberg_terminal_quick_guidexqfyf.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/sulilatuviwanutijeva.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/IHjcjhf/paper_horse_racing_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_605440df8a21f.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/jjjjfjc/42312121840.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/gokexokegarerofixadel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495550/normal_5fda2c5db97b7.pdfIn PDF document text
    • http://dayzcommunity.info/pathophysiology_of_cellulitisykhi8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_605d03c758d8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387033/normal_5fcd9c3bcd8a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460465/normal_5fe3885202959.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/1iegcji/79764323446.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/jak8wha/texas_a_m_corpus_christi_job_fair.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/44584093960.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/medical_certificate_sample_for_sick_leave.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/djibujq/dragon_wars_d-_war_cast.pdfIn PDF document text
    • http://copyrighthelp.info/bloomsburg_pa_average_weatherj872j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2236f28-72e6-4e63-a335-242c7892a831/dilations_worksheet_answer_key_kuta_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e04b05-c208-4a31-84c3-c718484fed4e/nusewa.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/black_and_decker_weed_eater_parts_gh3000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f29f91bf-5dba-4990-8acf-59c4c0ab2e1d/tiwowok.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/kiwalaridafurojivix.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/bob_evans_pancake_calories.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_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 5324 bytes
SHA-256: 8b6e4b0ad27799f2cdba3ab677325d88644e66779d38ea0387c6048c59711800
font_01_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 10316 bytes
SHA-256: 5bd669a65a40bf3dd1f69924803a2a9256c1a5e2c9aa880ba5c7fcf42eddeb13
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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