Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffc76bf4b7a4aa5…

MALICIOUS

PDF

80.3 KB Created: 2021-10-10 03:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0be2b2c5c80a32c71f65d3883eee66fd SHA-1: 414703ad1e3703eea13fecf55af43b8ee44cc256 SHA-256: 2ffc76bf4b7a4aa518ae5d8efb0bfc4507760c9d6c3e406de3c98ae929000e57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF, with numerous embedded URLs pointing to potentially malicious content. The PDF structure and embedded content suggest it is used to redirect users to external sites, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mrhobbscoffee.com/images/uploads/file/9267800469.pdf In PDF document text
    • https://zapret-rf.org/web/img/podborky/files/94465974059.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/derojoxagopabixodatekuwid.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/todilonume.pdfIn PDF document text
    • http://agilesolutions.in/uploads/82618388408.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/23978618433.pdfIn PDF document text
    • https://servicepapik.ro/files/jumulosidevubopi.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/nojalofofufuvuvisusigi.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/sazibokirovu.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/mototebiripemunivi.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/5001925873.pdfIn PDF document text
    • http://eur-idea.com/userfiles/file/15504837938.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/mudod.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615d164fea41e---24697860153.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/67729307030.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613211c5d1783---5181037032.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/tinus.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/vovajewujitovezulef.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/batedawolarozima.pdfIn PDF document text
    • http://sro52.ru/uploads/files/44117263034.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/ruxajijodet.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/94126322969.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/5763716829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=take+me+to+your+river+i+wanna+goPDF link annotation
    • 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_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 10656 bytes
SHA-256: 23ad50a774d41a8801f4386fd096ef35616bdd41afb03040bddb5662e8b84a58
font_02_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 18140 bytes
SHA-256: 7f6cc70370be3eb137351ff72d9bab0a96d05ab12f033c51eb80682166e354d8