Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53f9cffad101839…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 11:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3374c7e554dab686a5909144897ef17 SHA-1: b7a5968156815a98875ddbaeb208c61d9daa45e9 SHA-256: a53f9cffad101839d6963a08d90ace2680fe35609c8144ef205cd51d7a74994a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of multiple external links suggests an attempt to redirect the user to potentially malicious websites for further exploitation or credential harvesting. While no scripts were explicitly extracted, the PDF structure and URI heuristics strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=ndtv+app+for+android PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfeda205be---83699908245.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/52758213843.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/94942648755.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zenegawej.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/54232564884.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/baxefalur.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/zipexumuza.pdfPDF link annotation
    • http://dytac.hk/userfiles/vosoxixa.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/5227596773.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/kukazimoranokid.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ed6c1c1682884aa9b846123ab9ca604e/firogezew.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/10445828922.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/peligewivutamesizuderak.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/26887712840.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/13401648437.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/xibape.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/rezomemajuw.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/xuwoguvadawarawizen.pdfIn PDF document text
    • http://sayarbobinaj.com/file/18733382777.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/24451251401.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/8340635009.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12986186227.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/vatoba.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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 18056 bytes
SHA-256: dc2df8f6d1798cb438bfdb261239a3f848836ca5d853f1a4e2dbf94d9ecb1397
font_01_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE8 10188 bytes
SHA-256: fb41ec88e154b4941d43366b1ebf2a6b93cdd81149004a3b0a50d8e75614f660

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