Malicious PDF — malware analysis report

Static analysis result for SHA-256 158647ed7804c7a9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 11:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e95f1cb24938f7d07282f6eb2d645c00 SHA-1: ed6af774bbd8a2748da5a482631008fd9d05abab SHA-256: 158647ed7804c7a95c409c6e16919b64a1d9ec504533c444898ef98f1f7bc985
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gabinetortodontyczny.eu/userfiles/file/zubul.pdf In PDF document text
    • http://portalpr-b2b.es/img/user//file/_0903431001630795055.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/20584006843.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/zemekidinutumapefavu.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/96192171363.pdfIn PDF document text
    • http://wamer.org/userfiles/file/mujupofijovafinazoraf.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/14011394342.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1fbbdde55---35231703548.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/64457204241.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/jeziwudenuduv.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/varagolub.pdfIn PDF document text
    • http://arsvet.ru/img/upload/walatatusuwoxapuwi.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/17892574149.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/getake.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/62763661848.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210831_170917_4952.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/49453417723.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210904002854.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/wagokufaxujaruf.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/xunoleganu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zisuzapoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+games+76PDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 17924 bytes
SHA-256: 0c3d762fb775639434bfffaa08897cb2185e29a002cb8c31e4502959dec4baf5
font_01_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 10184 bytes
SHA-256: 5fed9b718c8c423e0944ea798410ed98754cccea6441e3a58a0d832bb1187b85
font_02_sfnt_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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