Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a7ac5bc169432a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 08:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7483889ae8967bf5122dfe5beef6defb SHA-1: 6e3e52159e83b150846c16da2aa99aea7a62d9da SHA-256: 86a7ac5bc169432a6b63a82693ab1c5a0d188cd52b67e16100d731f481470cd8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number. While no scripts were extracted, the PDF structure and numerous embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://melvin.cz/data/56611455364.pdf In PDF document text
    • https://tskrea.com/userfiles/file/89229356963.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/60302394210.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/75611804110.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/16337445115.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/kakoxekuluvefuvojo.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/34583122612.pdfIn PDF document text
    • https://timminsrenovations.ca/file/aKsGqNipRQroYJIn.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/32129920662.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/wujajuvol.pdfIn PDF document text
    • http://coumert.com/images/file/78405391305.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/32777585185.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16149229e35b72---29261418327.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210923_95E55AB3CA3F9F8B.pdfIn PDF document text
    • http://vswet.ru/f/jiwuzowibovakofovokawed.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/15825930465.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/jevuzifusisup.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/64263787551.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/kisidewisuzumatazib.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/kefunikamadeje.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/47791849050.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c22ba9846---wofivo.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/nenaxebosutemexevux.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/77400665367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=legendary+ninja+origins+mod+apkPDF 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_off0000b1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E1 15120 bytes
SHA-256: 7f2344459202186ece343b59331a6251ae628ea698cef5fbb9fdda5663e7d50a
font_01_sfnt_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 10884 bytes
SHA-256: 0fd658546941f3b7ce021030ad2948b8fabec9035cd8dd8c60ed7f554c873d9a