Malicious PDF — malware analysis report

Static analysis result for SHA-256 b866a647c562b103…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 00:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ce63900b0b86d4d6b2b7d9bd82d3c21 SHA-1: 0cbc3b083ba463a444fff9c4b0cd96da36ee1c97 SHA-256: b866a647c562b1039d6ba8b848cbb69598f2393697c00c7095f2e57c6be8c157
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, suggesting a malicious intent to manipulate search results or redirect users to potentially harmful content. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a phishing or SEO abuse attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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://goodnest.info/tctt/sites/aaa/file/86905676965.pdf In PDF document text
    • http://licausi.it/userfiles/files/52060331186.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/24600808007.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/kilibu.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/92970037217.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/57943816765.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/86908160717.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/4625828286.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/12370080569.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/gakarobige.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/pifediguninuvis.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/53567272019.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210905_193217.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee8a9a324d---35963331443.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/kapopapinenefasurafitazok.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/dumidipuf.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/fumasedixomokowabugoto.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/99433150047.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///sibonipukurefomaxonu.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/74817991148.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e3f71a88---16954383540.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210912004512.pdfIn PDF document text
    • https://bor-diing.com/upload/files/38270239978.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/29368005366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cheap+hair+salons+open+near+mePDF 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_off0000bc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7B 10452 bytes
SHA-256: 167e9f2a6f578f748d9de2d2b8a0483c17348f0ff38ad678b6a7fbdcff2152b7
font_01_sfnt_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 17176 bytes
SHA-256: 7b1cf2750a9784d25dd32154342abc3dbfc1b2c124b99327d02aac360048531e

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