Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae53e091f26d76f…

MALICIOUS

PDF

83.5 KB Created: 2021-04-02 19:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6b92b16963ba5aaff0488c9136d15c22 SHA-1: 8e0cb737600c12af88f3e8ab0c92a181f2bc0bd6 SHA-256: 8ae53e091f26d76f4976333a7849f94e69681bcdfe63a323f58404dd6511b2d4
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://baarspo.ru/award?keyword=adam+bochenek+anatomia+cz%25C5%2582owieka+pdf PDF link annotation
    • http://scoretdho.best/lanisazebeweke8kqih.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/0210184.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/ijgemgj/rovopojupi.pdfIn PDF document text
    • http://znasila.ru/photoshop_cs6_full_ingilizce_indirkjuv1.pdfIn PDF document text
    • https://cdn.sqhk.co/dexujagafir/iVsjbLw/rexutoki.pdfIn PDF document text
    • http://reduslim-italia.website/emulator_dsi_android8cfua.pdfIn PDF document text
    • https://cdn.sqhk.co/wemupaxuziv/jcjfids/43151725830.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/1f1a40ea5.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/how_much_does_a_30_inch_viking_range_costvcazh.pdfIn PDF document text
    • https://xovokemuzulu.weebly.com/uploads/1/3/4/7/134703915/rotox-rilul.pdfIn PDF document text
    • https://miboxijudowisu.weebly.com/uploads/1/3/4/4/134491333/3242375.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/fa3b1546-299c-43b5-872a-51b071023a2a/cloud_security_engineer_salary_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/74365286194.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/lenovo_y50-70_battery_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c215deba-1226-4a13-beca-097a9f74de65/everstart_maxx_battery_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a54294-e3a8-4dbb-9b2a-c10052bd76b1/the_heirs_book_kiera_cass.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/papiwemekivil.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_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 5480 bytes
SHA-256: 547a2dcbb94e92e7238ff498f60df9df5e77de0e4ae6ea3624ed428ae2b00388
font_01_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 13940 bytes
SHA-256: 278ffd83d66f2406743d6308d030e1a089ce25e5e3d1dab544e72d1ae92db32f

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