Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b07ac84f689680…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 07:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b29bed93507f297e4272b8ade80b1426 SHA-1: ef2367fab703e23d9a2ec23b5b51c90b7ac6a82a SHA-256: 08b07ac84f6896803695d2f4e8621350c145691a8782682bbf6ef1c92de33d9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious or phishing sites, suggesting it's used to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=talkback+braille+keyboard+launched+by PDF link annotation
    • http://heathrowairporttaxi.website/userfiles/file/tetabudaruweg.pdfIn PDF document text
    • http://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/sodibupevekulalumiwava.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/10320066711.pdfIn PDF document text
    • https://jin-ji.com/upload/files/71925101959.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/28840475714.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/83664722227.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/xolumokonegowutobixaj.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/76788806590.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/legodafazadubib.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/64499813061.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/28367125544.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/nibizamepekiga.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/vitudakifatu.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/80612198343.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/94350538584.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/galebujaleroturerim.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021991849348777.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/7586466612.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/38081272770.pdfIn PDF document text
    • http://slsnn.ru/content/file/19345358131.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/toxinesinomut.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/83070205940.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/39901265920.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dIn 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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 10608 bytes
SHA-256: c343db63773c4d18164e444bc0aa0cf8494c093d3e0b2b6441154e92c1f649f4
font_02_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 18552 bytes
SHA-256: 1eeea64e64eae6b9d06979a97990449e3d3fe55196f43c21544f8a6e1c05dc61

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