Malicious PDF — malware analysis report

Static analysis result for SHA-256 e160c57b343cfb47…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 03:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31eaf04215a1beaef900b35f18ee6af5 SHA-1: b62a0a411bc4b8ce2eae89f46020f912cf6711e6 SHA-256: e160c57b343cfb47d54ccbdc6c096cc6d409c70d3dbb765dcd1105b4ae416d6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to disposable domains and a link farm heuristic strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://acunambalaj.com/adenoto/upload/files/80440688289.pdf In PDF document text
    • http://fitviewer.biz/files/file/bebamuzexolateponexe.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/54445681019.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/rapuvuduxozame.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xewuxapazefuviroxamizo.pdfIn PDF document text
    • https://webaprint.be/img/file/17195009821.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/xudavidilijazos.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/88803065317.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/pakuruzupowibedaxizepekel.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/4956345682.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/dogilozopixe.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/pijivudubewiroxovu.pdfIn PDF document text
    • http://quranday.org/userfiles/file/noxoxakoxuvaru.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/sipoxibabagaxafif.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/mubovanaz.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zivagozepedumim.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/47582012283.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/43058158226.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/lirajubojaxogili.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/nifanosurodip.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/3469338064.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/79865988165.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/25504798411.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/xudipelepuvizezo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136be6b6aeac---74456705365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fire+red+gbaPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A3 10004 bytes
SHA-256: 00fbbdf1b66f3bf4538d1a9d3aa47bb93c81dfd5004dca8beed8b42d249c7766
font_01_sfnt_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 17072 bytes
SHA-256: 07eb1a7946b528e11ba372c42851caa9ab46b4f5c4504f3866879e24ddb37682
font_02_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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