Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e504ce33c022f7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 10:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 942b68cd5e75d1478eeaaa4494edb85e SHA-1: 9c933aec1f463d0b482f09ce8f54c864b8f2f2c0 SHA-256: 12e504ce33c022f788dde4efbeac0a9b35491e9319fae37fc6301ed7ac9aa05b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to external resources, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=dark+mode+on+chrome PDF link annotation
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/48066084900.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/lupubudiwov.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/jokaviwukolunovenobebun.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007dd50584---jewabekejuku.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/firagilubelitawewax.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/vifasu.pdfIn PDF document text
    • https://centralcms.coodex.net/galeria/files/duxewopeje.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/18633847429.pdfIn PDF document text
    • https://tomaszbizon.pl/web/uploads/files/67614073514.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/42442714781.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/bepigesoxalibivesazusirem.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/54408849300.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/wapoder.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210915105035.pdfIn PDF document text
    • https://sopkambing.com/contents/files/88148144041.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/6917374379.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/rujam.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/50616620433.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/zegulokarazex.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/jemajeluzosumofasafimak.pdfIn PDF document text
    • https://network-italia.com/file/furonarinitivugexufov.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/27046465707.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/zubijatevomon.pdfIn PDF document text
    • https://n-tlg.com/files/file/fesujuxepaxu.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/24311393833.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_off0000b036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 16344 bytes
SHA-256: a44fb619ae4bdd37770d8808a363066dd9a595c51513df3f10194d14327b0f12
font_02_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 10324 bytes
SHA-256: eb1c0a764251593b231edfef51594d1786982d0dc85c15c384d06ca336242d50