Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec423df8a73e723…

MALICIOUS

PDF

87.3 KB Created: 2021-09-22 23:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45d59a10437c916716893b26a9a47266 SHA-1: fa12c976c64468b6de198a1349c44951a2ffe50b SHA-256: 7ec423df8a73e723da00713dfd17c33e50e8949c314d56ca82a41ee25c2ee581
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=call+me+by+your+name+book+free+online PDF link annotation
    • https://grafconsulting.pl/Upload/file/kenamuvepamojagawara.pdfIn PDF document text
    • https://polandpools.com/contents/files/sigerenuxorapo.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/wapewinit.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/bajetikotenasikejorofuxet.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/kimemugip.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/fubonoveleja.pdfIn PDF document text
    • https://cathita.vn/upload/files/21663695080.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/lulipevovat.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/90786804345.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/89681667233.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/72001190343.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/6859550761.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/wekiril.pdfIn PDF document text
    • http://smogy.ru/files/files/lubodevufigaterijeluzanu.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/rasunupizeluvudiko.pdfIn PDF document text
    • http://pbpharm.com/upload/files/88643619757.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210921081152.pdfIn PDF document text
    • http://tzsunup.com/upload/25852255694.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613fd9b46f21d.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fazadunokerolebosufirufim.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/84835370553.pdfIn PDF document text
    • https://angkagenap.com/contents/files/25375101170.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/77122758951.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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 18640 bytes
SHA-256: 26eaecb445626d94116324f0d9d04d10d939f8cfdecc1d71109480cde894afe5
font_01_sfnt_off00011d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 10588 bytes
SHA-256: fee8d0186fa12a2491682e89c2f8be7300def08c3da6a21ab13dbca4bf1bafbf
font_02_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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