Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dabf1a4beaa889b…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 04:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ea8aab8520c27defc6c808f7851c79c SHA-1: af8cda54edfe284556a24fd75c23684ba6789aa0 SHA-256: 9dabf1a4beaa889b85291edce6478ec500f732938f65cecb79e3219ace8ea9d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm hosted on disposable domains, with numerous distinct hosts, pointing towards a phishing or malware distribution scheme. While no scripts were extracted, the presence of many unknown URLs indicates a strong likelihood of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aptekarynek.pl/zdjecia/fck/file/bulufuxebavusisewigi.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/zenip.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/58205172858.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161457c0e3f3bb---bewekuguza.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zewelakilepuxujeseji.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a8f751342e2d99adb74054d5819739ae/96590225548.pdf
    • http://longbeach.ilovepokebar.com/uploads/files/buxaludusaribowuxuzizares.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/47289898215.pdf
    • http://studiotipaldo.com/userfiles/files/30588174319.pdf
    • http://lulanjina.net/upload/files/28311510940.pdf
    • https://youxsoft.com/uploads/files/10273267906.pdf
    • https://shopinhome.com/ci/userfiles/files/95914102768.pdf
    • http://rudolphi.nu/userfiles/file/75282377959.pdf
    • http://levakov132.ru/userfiles/file/punuzepogirirolaran.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/2109111548363619030ikgi.pdf
    • http://fese.in/ienupdimages/images/files/3119400911.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/lepipiredujapusavabimib.pdf
    • https://evergreencans.com/userfiles/file/tulatodasex.pdf
    • http://ddgasul.com/userfiles/file/valupopakukupotifivabire.pdf
    • http://corporatiegids.nl/uploads/files/buxitur.pdf
    • http://vuoncotichdep.com/upload/files/boxusutuwonod.pdf
    • http://lollanaclinic.com/image/upload/File/43309992817.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+best+ebook+reader+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB117 16792 bytes
font_01_sfnt_off0000c929.bin
360edd1ed383f45a986d5d5dac8e015e81ad9a41e9465977491aebf2b0427cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 16120 bytes
font_02_sfnt_off0000f1f3.bin
d5e851f26138b7ab884f5e68f5e3beed5298b10caead8764bb662edce6437178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 10444 bytes

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