Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aeb617d76b673cf…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 14:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff1245e5a392f81b0589dd4eabbb4b66 SHA-1: 6f0dff0ba66e873f1e599500828c4ca2a7a879bf SHA-256: 1aeb617d76b673cf90929289534cf28bf850048f380095f7b68439273d2902a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. It contains numerous embedded URLs that point to link farms hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=aplicativo+leitor+de+texto+android PDF link annotation
    • https://yar-net.ru/userfiles/file/fuzotokosot.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/88277799855.pdfIn PDF document text
    • http://sireny.net/share/files/japofiminikidugafuzebezi.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/9483092666.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/pejopiluliwukegasu.pdfIn PDF document text
    • https://rm-parketi.si/uploads/lipoxagowonuvevem.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/14642516036.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/28973214986.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/bigulim.pdfIn PDF document text
    • http://guowangcable.com/d/files/39112781886.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/pudexewimujod.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/sevimigodufegadar.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eedcd00f8a---16856356415.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/gidavemoginumokimafidas.pdfIn PDF document text
    • http://apsons.eu/files/file/murijajugufifolekotofe.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/22904359f00f6180b3b758fd6de89bc3/88053520755.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/xavatelot.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/54379588326.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/35207352184.pdfIn PDF document text
    • http://balone.net/_upload/file///75672879516.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/sawebipudokumedowube.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/xatib.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://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_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 10488 bytes
SHA-256: 1d1bd7080e4bea46a66dcdacab9819e3b6893d04927be3c7cb997998fe67618b
font_01_sfnt_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 19916 bytes
SHA-256: ed165795c1083a0f7b5b0056226f36ee62fbc51a4d27887eee42ebd876530bd8
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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