Malicious PDF — malware analysis report

Static analysis result for SHA-256 790367e601575395…

MALICIOUS

PDF

76.9 KB Created: 2021-09-09 10:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6dde5f63804d87a697d0f03e08a95440 SHA-1: 32919c42f381ef01a5cbfe882cafd0818a53d831 SHA-256: 790367e6015753956872aca3c0451e86837c220a6b4b57c3dc2b06aad4a25019
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high number of distinct hosts and links, reinforcing the phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613908f156ffe---59816486488.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2679f93f73df20c6f43383dcf0d45c91/38802876417.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/55806936689.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/zevodureberako.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/dagowu.pdfIn PDF document text
    • https://profm.hu/files/file/zozugale.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/fababajawuxupexuxojezokex.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/faxal.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/66423336187.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/87057798199.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/38390171452.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/19306005507.pdfIn PDF document text
    • http://newcityhk.com/userfiles/daxugipilu.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210908_000146.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/6650924006.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/sekidupuxovi.pdfIn PDF document text
    • https://zhansq.cn/upload/file/38256981768.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/52092442269.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/xumoritepebadinopetor.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/wabifapijog.pdfIn PDF document text
    • https://somogyplusz.hu/files/29433521600.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/mipuzuposejokabudufin.pdfIn PDF document text
    • http://apsons.eu/files/file/30853989336.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/7793559199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+mobile+spy+softwarePDF 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_off0000c7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 17888 bytes
SHA-256: 5c8ab84bb57bd244fd3352d8d33b406f8f1aa27c6b74f10ed4977d0ddcfc62ed
font_02_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 10732 bytes
SHA-256: 17025502dfb3a2ff0ab5bfa19f9dcd10ee14c565676b7339d9a3aedb350236d7

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