Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1a526f16b10fe4…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 08:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a801dbf3e8a3e8551d546ab52a4a0bf SHA-1: bb53f04578c6533776a8e860a14dc3fc46858988 SHA-256: cf1a526f16b10fe4dc9323368c5847e10d914f0eae07311604802dbbf901ec81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://archism.ru/uplcv?utm_term=tandem+cracked+apk PDF link annotation
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/75926176321.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/wukaligof.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/xalukikopezanesenoteko.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/40538350100.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/80535658373.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/81271879696.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134087e837f0---xoxufusiwuxetopa.pdfIn PDF document text
    • http://ecole.ru/text/images/file/99518265698.pdfIn PDF document text
    • http://i-physiology.ru/upload/97839860549.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/vufatamumuzalebuxobudiba.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/sojefuwupakomovurapo.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/17522217380.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/77444052389.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109061551258425.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/38312636767.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/zutevoxasizefagisinopebo.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/21607966828.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/dezokok.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/60645928410.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/xatubolasovopozujok.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/limijir.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/68654245220.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210913162957_283hov.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/24808814700.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/bopanegapeti.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/72458193711.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_off0000b422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 10208 bytes
SHA-256: 166ac3216247e8ba4c6b88d3bce86926957e036fc9f26c5d5094f64209a1ee43
font_02_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 14212 bytes
SHA-256: 0a072c8da7f5089a9cc56bcda08f600a42651779cb6042e61b8d93fce060cf2c