Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe4314068a0e9b4…

MALICIOUS

PDF

81.3 KB Created: 2021-10-19 17:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7e5537c83f949403a3cb36297621c11e SHA-1: f1ee65939d2beccfaee8d8fc486e65c1b5c3e365 SHA-256: 7fe4314068a0e9b485d0261cfc5bc6d4dfaddff85e3c45f2eb8f51f6dc62aa01
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and exhibiting characteristics of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic suggest the primary goal is to redirect the user to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=pl%C3%A1ticas+pre-bautismales+en+l%C3%ADnea+quer%C3%A9taro PDF link annotation
    • http://yizhu580.com/ckfinder/userfiles/files/mifatabugeruvonojitu.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/93975948723.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/58731394984.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/6340649499.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1634069913.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/fulele.pdfIn PDF document text
    • http://maidichike.com/upload/files/vevizizejutux.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/20062845202.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/96616856282.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109040758022748.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/76606258059.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151af344f2f4---dovuzixezizalividob.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/watolopoxexenex.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20211010163383067561.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/15901211749.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/pukuligodaji.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/fazonuzixate.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/kubezenosozakeguje.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/xuwopovinuletijubuxasapuk.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/43206289052.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/23979894019.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/zojeribojifitegizus.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pudavivazonafokinitex.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/97166805684.pdfIn PDF document text
    • http://dnepropress.net/files/file/gapavudojofeboxuxagox.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/fexajizedavumazexo.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/jepegaxekatupejinolokune.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_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 19984 bytes
SHA-256: fda4dd0d3e86c0edbe17458ac78190accc66b4ae7a91d5ce3b8287423e7e0384
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 11352 bytes
SHA-256: 15b1db4a94676ad72df24a125ee7a2481efc7a9475e01ae54f014edf98ca2140

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