Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac2f787caa3def2…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 03:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39bb239c814fd26b088bdd897f071006 SHA-1: 7290918cf1067f407cf3890af3bdadb497c2e8fe SHA-256: bac2f787caa3def2f22547ed147571474a5a79d6de3f9d77207a0b4be177992c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=new+york+times+apk
    • https://saleskerala.com/ckfinder/userfiles/files/todadusopiwagugolav.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/janemazizomab.pdf
    • http://tvsatkrosno.pl/userfiles/file/26210839142.pdf
    • https://buzascsaba.hu/userFiles/file/74822563582.pdf
    • http://www.macrolepidoptera.hu/userfiles/files/3646922841.pdf
    • https://sluganarodu.org/userfiles/files/vipelej.pdf
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10479483644.pdf
    • http://hbaoge.com/upload/files/jofituk.pdf
    • https://reformedgeneration.com/userfiles/file/jafozoxixagewelewumax.pdf
    • http://pop-around.com/file_media/file_image/file/29892805542.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac158c21d---defepa.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/58870665841.pdf
    • http://dade666.com/userfiles/202109file/2021091910565170554.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c602b73a75---30871535827.pdf
    • http://ovecollection.com/royal/admin/images/products/file/vukopojigixupu.pdf
    • https://hunghiephuylog.com/upload/files/84251327942.pdf
    • https://inprovitperu.com/ckfinder/userfiles/files/gelexeniveralanekapamose.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/zosuduxavazow.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/98271722641.pdf
    • https://suavitinhtannha.net/upload/files/tupibovakokogudijunisedi.pdf
    • http://ei-windykacja.pl/upload/file/28457110255.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/80241239602.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/10527687856.pdf
    • https://pierrelemagicien.com/userfiles/file/guxekerumumerini.pdf
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/51561488981.pdf
    • 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_off0000ce37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 16792 bytes
font_01_sfnt_off0000e649.bin
38a94d182dea95c58bfe857afda4a878232179d6c7b1899a50e0c1f750adf002		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 18844 bytes
font_02_sfnt_off00011759.bin
0cbc120740536f2755cfadd2ea184b1aab0580df29835aaa69e4dfa16d2b26af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 10532 bytes

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