Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f63e462b2aeea6…

MALICIOUS

PDF

87.2 KB Created: 2021-09-09 17:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ced3acb54e837b07cc481d1aaf449c4 SHA-1: d1ada827ded1be80f049f972dc8c6d006e744559 SHA-256: f8f63e462b2aeea69a40f5320f1823785b6e3a16b4c53fd64ebb401d835a58b7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URIs pointing to link farms on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a download button lure further supports this, indicating the user is likely intended to click a link to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=calculator+app+hider+apk+download PDF link annotation
    • http://ewtch.com/upload/files/zujojowawepu.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/namefafogesavesafenago.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/gizilopuvubipaxe.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/96117744937.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/viravurawovipebopezo.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/92104232497.pdfIn PDF document text
    • https://shinaltd.ru/images/file/40870329664.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/veboxavegere.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/duxitepivo.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/zorirerotijifogumafunezox.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/75554087946.pdfIn PDF document text
    • http://vanhacollection.com/images/files/jegalelixetuwetomuduvod.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/fekukesutibedomuba.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612f116ccb63c---wibedotigusetuwepolebaj.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/bowodubimosizi.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/29843134065.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/popexituzoxoberobitijokix.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/kanobaborezowivasasefu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e5d2ec2839cadee446bee39eb5614cef/verutufudufojesugufum.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613248592c91b---98947043090.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/bamugipumeli.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/23983626391.pdfIn PDF document text
    • http://esipro.be/userfiles/file/2999290316.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/63296421626.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/72320034300.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/57110312726.pdfIn PDF document text
    • 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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 10752 bytes
SHA-256: fb7184e442f67dafaaaac50e63ed80a27256e5b451b69b547077d086e790586a
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 19064 bytes
SHA-256: 19bed9f02fe95b6d414fc6ff3dc7988c79c2498ab7c955aeb5acfa6baba25b5b
font_02_sfnt_off00013697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1