Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e35858772336a68…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 15:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa23fe5bd8bfb422f4bd9b3c998b2bf4 SHA-1: 7fa8fbc180edaf7f0f3aa3a8727b4660fee531cb SHA-256: 4e35858772336a684bede8d15df144da341c2dd2199847cfb65e23addb9be54c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to a network of other potentially malicious sites or files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://portaldeaquidauana.com.br/ckfinder/userfiles/files/butulijumojogu.pdf In PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/zilekipetufevisamamaduf.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/41422664410.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/risutu.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/62250431378.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/jexibiluk.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/zodewudowujox.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/18711274625.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/bosukusinelabokute.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/mepeperi.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/78459856440.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/64623829091.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132f01dcba3c---lodidipam.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/tatunotatul.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/mijemozi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161392d48c8c48---26495616218.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/89431547872.pdfIn PDF document text
    • http://epplast.com/files/file/gekevib.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/17596456482.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/nupozolobibodepes.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/95469641088.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/muzineb.pdfIn PDF document text
    • http://profstil.az/userfiles/file/gusenabukubupijojapob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=genius+scan+apk+free+downloadPDF 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_off0000c058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 10832 bytes
SHA-256: 3f002c0a4e866a0ab08a647375886172399837d7d12371347342bf5820cd6ac4
font_02_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 17616 bytes
SHA-256: e571444acac6264241a71595596d6d4702b3d78f8a5d32adc79f400d2aada40f