Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d24da2aee272ad7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 05:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: de5833b8a7207c464eeef3c577335265 SHA-1: 8eb43382f903389a516bad602f96fb133140f17f SHA-256: 9d24da2aee272ad7b59c5cdf87171fd6f62ad8515ed8f26672f8733e45e6ffea
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 URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=imo+chat+video+call+free+download PDF link annotation
    • https://www.terraton.com.my/ckfinder/userfiles/files/74451778913.pdfIn PDF document text
    • http://corkpotters.com/images/11599197847.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/nukewakidiragoza.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/kiderixuj.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/39377371405.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/90658547869.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/sosikapozenedejo.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/52517696571.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/zerefadiju.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/64375773336.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/98007551088.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/valudawelupediri.pdfIn PDF document text
    • http://vititanon.com/user_img/files/wemoridiwofitedok.pdfIn PDF document text
    • http://esejsc.com/upload/files/94743570983.pdfIn PDF document text
    • http://hailiaquatic.com/UploadFiles/file/56366992354.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/77843882744.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/gosabef.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f07f282bf8---27453474091.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/witubixomok.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/68883445569.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/mivediduwajoselinapotax.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/jagozirowuvawetasazolumog.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/wovibexa.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/kukugosikusilipuk.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/naxexikenewe.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_off0000b56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 16776 bytes
SHA-256: c43c7d4e5f2d9c737e1eaec9411d0fdc558710fdebd5e523c12b463e38d91842
font_01_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 10676 bytes
SHA-256: 9505376b806cc66c56b5d05238b2336b58abe34575cef92e14aa2e24a4c2c1f4
font_02_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1