Malicious PDF — malware analysis report

Static analysis result for SHA-256 d021cdd4a099cd8c…

MALICIOUS

PDF

75.5 KB Created: 2021-04-07 02:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ffca7a625af3a6f43bbab5f7f9e6efd SHA-1: cb13945b1f9eefd4fc25c191ec53db9046feae2c SHA-256: d021cdd4a099cd8c0daca8c8b4064df691134024751bc1d8657b8e7fb31804c6
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://golowaki.ru/award?keyword=microsoft+office+2020+volume+1+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466166/normal_606c73f797046.pdfIn PDF document text
    • http://thestablestl.com/tibenedekesuliwi8yty9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_605e0726c89cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409623/normal_5fdec9d253d13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_602ed7a75f522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447437/normal_5fe0414aaceb2.pdfIn PDF document text
    • http://potuduwatolebu.mywebcommunity.org/inorganic_chemistry_by_huheey_free_download.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/2020_space_odyssey_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_6000fddea26a3.pdfIn PDF document text
    • http://fragcups.com/template_roadmap_powerpoint_freeqiqd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_602d20eb6a297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381546/normal_6001699695912.pdfIn PDF document text
    • http://floradoma.net/period_tracker_deluxe_apk_free_downloadmacxw.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/aruba_clearpass_isoehxei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_60462305ca3f5.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/lurutopobi/sharp_alarm_clock_spc189_manual.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/zekovibetomuvubawo.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/perrines_literature_structure_sound_and_sense.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_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 5484 bytes
SHA-256: 3b9aeacc3993678735f79486bb3d2683d65101956446d56d1277e797473af5a4
font_01_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10780 bytes
SHA-256: 4011316458b33584ab13b1cedc11f92e3a3a7bc4b806498fa045ec5450b25fbe

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