Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a61ca0f7ab3978b…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 02:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1d89a6b0f05cbbd6be0024e458b62a0 SHA-1: b5c1b21fb61f796d619f685f04bedf676a6dbca2 SHA-256: 8a61ca0f7ab3978bbed3c96af5eb4b9caf04a17b7b944d3c556aa48363d1f308
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, with high confidence. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://jagamimpi.com/contents/files/ginunotapuwugovubevex.pdf In PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/79669207195.pdfIn PDF document text
    • http://hocomesun.com/upload/tovifulofalotikomefa.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/57660530271.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/kewijobuguxufisazasunor.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/66234126651.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/27469491858.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/gubibituwizusedijobono.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/40737044513.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-6/20210906080005855675.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/notopukezefiposobozuwaxod.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/penawutiw.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131fab96cba5---ridor.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908092228.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/99439026340.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/62317687758.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/70838518738.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/10516771334.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/30566243467.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/52809397318.pdfIn PDF document text
    • https://yellowstonewildlife.com/99278534175.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/26384538954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ome+tv+free+download+apkPDF 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_off0000b893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 10668 bytes
SHA-256: b6588ba32de77e1a2eab30de770733cabd0d019926212fde8c2fca648b04d9cf
font_02_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 17424 bytes
SHA-256: 3ce1dead6a073108e06199d9c58d9f5255429b38b589d7fc7719cb4210c4ab63

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