Malicious PDF — malware analysis report

Static analysis result for SHA-256 807f6076ffcb57e0…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 07:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b47937db8f574265b7b35569e093f8de SHA-1: 7642938902ed0e4bf2f184e75c8dc19b3bc3a922 SHA-256: 807f6076ffcb57e028c5384b1bc7caf04aa5b8b7f5cb9f4b9aa4e5df43d2fdce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://cqc-material.com/app/webroot/userfiles/files/5637732873.pdf In PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/59442437516.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/wovigodoxuwevino.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/jukigolimagot.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/rafuropogofetetegeravi.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/giwaza.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/tofipesozapukom.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/fexixirorekibaditijibu.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/68721499627.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/38432037622.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/65626886694.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/74184842588.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/zelilinuj.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/90495498850.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9utg8dirrrp0687ibf5vqpunf2/11823931201.pdfIn PDF document text
    • http://mebco.ru/images/file/wedatuvipo.pdfIn PDF document text
    • http://airsoft1.ro/files/file/92887583458.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/84637887665.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/pavemojij.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/20417122923.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/ranetixawase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=notepad%2B%2B+compare+foldersPDF 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_off0000c702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 10560 bytes
SHA-256: 2125ffa31fac763ed0f4ceb812e72254464dc9606ad6ec43aea5b33d51158889
font_02_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 17300 bytes
SHA-256: 7b9dd4191d996c99cffcc4f18375554478f7cc4350a6273e2837d5580ad67bbb

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