Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a01f627bdd496e8…

MALICIOUS

PDF

73.8 KB Created: 2021-09-09 18:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f624cc972d38dd2a9492bfc2407c437e SHA-1: 4e812c5dc37c4215f5da4510f71351fb8243b624 SHA-256: 5a01f627bdd496e80bf8a723c66edc312c45a18c70a97f1687df56084440534d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior. While no scripts were extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://self119.net/upload/userfiles/2021/09/files/210905195914.pdf In PDF document text
    • http://metapolar.hu/tmp/zarukunadav.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/67327232125.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/wavevikudisatozutetijal.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/penifewemonivetowitil.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/viluv.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/8381453735.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/zigib.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/54112873158.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/94208837702.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/posurekefixadoxupuwizogik.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/gisifonanuxusutelak.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/59989335425.pdfIn PDF document text
    • http://vaithun.net/upload/files/lunofok.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/54476689574.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/kesovegisenatogeb.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/sokabitivug.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/63419871666.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/sibelofubepetoraxanig.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/17445366163.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/jaxapudamelan.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/39353519050.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/lotowamerewevuzino.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/buzevugisobexiloziwofabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=general+physics+pdfPDF 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_off0000bcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCA 10652 bytes
SHA-256: 6a59d3217d6bdbdc0846e7ab7a093108bd2855e029d7153b2b41ba1e697263c2
font_01_sfnt_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 17292 bytes
SHA-256: 3753cc175fb6b22d0827735bcf364e0ef315100df26e3ae20377cb64228b8ff0
font_02_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1