Malicious PDF — malware analysis report

Static analysis result for SHA-256 debb5c8d2abb1a8d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 20:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98817d37cbb32cfd34a9c91ecd5aad70 SHA-1: 770a3d068a12a1fe82d5631af02b2973e4ce5607 SHA-256: debb5c8d2abb1a8d7e1a88e75f1e92dc8e01758ba1d05d79ed6f75c2cc53437d
126 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 numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=dream+league+hack+19 PDF link annotation
    • http://giasuthanhdat.vn/Images_upload/files/bibujegovakirizigudazazi.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/1859226863.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/xobasavasivixojakifunux.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/77b618cb77d45919cfec8ed692a878f9/84980604304.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/jebizilugifotoneniwu.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/14614019073.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/jilaxepulalukevil.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/dajupa.pdfIn PDF document text
    • http://citty.org/images/uploads/file/28332075131.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/gavenugexawev.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/22035511058.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378ee31c92b---sisedewezasowajisitojix.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/nozoxeginazomojowe.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631575401600071619.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lalegefojabazixowunavilo.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/tufubazomodeveri.pdfIn PDF document text
    • http://short-story.ru/upload/file/13364175831.pdfIn PDF document text
    • http://short-story.ru/upload/file/gajamegutofujematexeto.pdfIn PDF document text
    • http://kahasat.cz/data/file/87899767720.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/99292584616.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/tunenepiwuguduvaxidepise.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/tedipiwas.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/gonafinilofadanezogusu.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_off0000b960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB960 10508 bytes
SHA-256: 43f37b5e16fd04a104b0f50b60988cf8648d138874f7b929b5c1bc13c929a776
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 18280 bytes
SHA-256: 6953046353ed880565ec12f2e45913c1bf81a7d71adaf6fd5cce4e4a25185019
font_02_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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