Malicious PDF — malware analysis report

Static analysis result for SHA-256 617a3798adb01e03…

MALICIOUS

PDF

105.1 KB Created: 2021-09-11 03:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: cc810896b5ae5fbf797a6fa2099582f0 SHA-1: ef6231a4c7f394a41c431f8feea6c6455950ad78 SHA-256: 617a3798adb01e0335b86b2dfe972da0cc5e6ed9911a9ced758fffe3fe6e1d0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs pointing to external domains, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aeronautike.com/userfiles/file/fivegironover.pdf In PDF document text
    • https://namhunglogistic.vn/site/files/wawuguwizoze.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/pogeboxuwufisubib.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/medadekijokerepujubuna.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/60118620343.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/mupoviwuduve.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/43791783010.pdfIn PDF document text
    • http://adice-area.com/pictures/files/60935168801.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/rewemipovukalopesuriman.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/vosadivabowakanavo.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/45042277055.pdfIn PDF document text
    • http://asja.ua/userfiles/file/63306910746.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/pufuzi.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/63317837045.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/nebajifena.pdfIn PDF document text
    • http://w-mill.jp/images/file/sudow.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904035349.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210908_035544.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/petuxadivosedotujoxetetup.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/17358241644.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/nekixapetupufolofetovuxib.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/82826935947.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/basetofebu.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/lumujifobowariwawefenisal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+long+can+i+keep+a+rotisserie+chicken+in+the+fridgePDF 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_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAC 19024 bytes
SHA-256: 6985002f0fde20b92a9c51db94931547488019759087fa9d96ba247bcfda3233
font_02_sfnt_off00017c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C1A 11068 bytes
SHA-256: b3bbf1af71b4a9d0131b328b210e2aa9a3c7135101b7d0d68b0266a59f8ebb76

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