Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97465c9df676e1c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 22:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca8e45d36727803b953481c47429867b SHA-1: 2e3b6c2a7a4ca3c35ccd6a90b7f0c09f4085a57c SHA-256: a97465c9df676e1cadffb9e3b7feeb94e8b214406eaa98df3b4547c9ffb7a4b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. ClamAV and ML classifiers strongly indicate maliciousness, specifically identifying it as a phishing trojan. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://hohsingfiber.com/ufiles/files/tezemijijitepabobazipawez.pdf In PDF document text
    • http://nousgarage.com/userfiles/file/dubofulekesamezifupuju.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/vomabokimok.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/sufeduzil.pdfIn PDF document text
    • https://polandpools.com/contents/files/gotelukexurasexaritowe.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/62897446909.pdfIn PDF document text
    • http://cartopack.be/Images/file/pikefibuke.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/81250951541.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/73017836173.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/daxuk.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/52681417742.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/75087419320.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/worusivozoliduvivuwoju.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/majimabojuwobawuxumaziras.pdfIn PDF document text
    • http://grossbuch.com/upload/file/60591331718.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/99404540589.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26687549650.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/bemulitijomixux.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/telinilikage.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/72131981932.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/mojiv.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/85457232178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ziperto+alpha+sapphirePDF 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_off0000adb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C8 17012 bytes
SHA-256: 17f8145cb6167777b266537505a6eedf6f09448bcd2bb3518d59725a56300062
font_02_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 10208 bytes
SHA-256: f9f54430b6eaeab82075d3cd27c3b4fa931d3fea909f9b5d5dc38f666ce2b91a

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