Malicious PDF — malware analysis report

Static analysis result for SHA-256 782df4c44daa9e9a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 07:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1816ac378bd3c1c93d227ec108b30e8 SHA-1: 30457de3390ece4908d723e17d1c08e0fdb9ab0c SHA-256: 782df4c44daa9e9a4463089af258e519d33872c506234b758b3bdc4e367b73e8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to distinct domains, consistent with a link farm. One heuristic specifically identifies it as a 'PDF_SEO_DISPOSABLE_LINK_FARM', indicating a likely purpose of manipulating search engine results or distributing content via a large number of small, disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://agama-rc.com/upload/files/37364658600.pdf In PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/roroba.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/kemazawiligefelora.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/43103743140.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/tekuvelutujefezo.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/32385799541.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091009504921663.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/61890372533.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/64870501327.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/62208569666.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/vemogusaxugufavowamitu.pdfIn PDF document text
    • http://okun.su/upload/file/96158299721.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109032147267882.pdfIn PDF document text
    • http://birdwatching.sk/media/file/94002562382.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/pemufobexenoge.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/xededokumabolajosamolana.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd1fa6de6---9349959766.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/xagegakejad.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135190c33d80---kelojefojaw.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/13360337658.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909120458.pdfIn PDF document text
    • http://herve-coiffure.ci/files/veniduwusonedilukikerufa.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210916044852.pdfIn PDF document text
    • https://rafautama.com/uploads/file/90053458998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=read+rich+dad+poor+dad+freePDF 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_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 17624 bytes
SHA-256: ecbd8ba2f7a042117e3859dcb8e6d080630f4f4db5cfbba885f374cd0db10b48
font_01_sfnt_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 10344 bytes
SHA-256: 3b139eeb2289b482da59b7de4b8f23820046b527550411ac65c1e5bbcf2daeed

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