Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c74e31081ecda3…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 00:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d26312d2e11fec692a46cf7ec0a13b78 SHA-1: c7824393df7d79851af091f3c20ab734cf2f9ffd SHA-256: 13c74e31081ecda3e57e5c53d45e627667188b5e64d4111b7e6459929eaad4f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.findvoters.com/userfiles/file/gemamokazosetatisa.pdf In PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/jugipuforitin.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/31130818654.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/dobarupusivebujikaw.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/botegusesil.pdfIn PDF document text
    • http://citra.cl/userfiles/file/buloneboko.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/pebadulosi.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/rigemovofowotifonulebitun.pdfIn PDF document text
    • http://partiaweb.com/upload/files/17536172158.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/6856806167.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/11600353351.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/lixibapuxo.pdfIn PDF document text
    • http://alajuusa.ee/media/contents/file/31249694069.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/moxepizifebotijerisepu.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/30224335885.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/57310083757.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/xazuzuwojisezururiv.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/mezewidowuga.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/92724970512.pdfIn PDF document text
    • https://soechi.id/userfiles/file/90947993490.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/wuvaxapumumiwo.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kogugilagul.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/penawutiw.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/96247297415.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/93058224409.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/99583184659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=clock+on+lockscreen+androidPDF 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_off0000b6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C2 10388 bytes
SHA-256: b3c7e20f89b3b16230d8c03d9921903dd6466b1ba66c4b3074ec6553a70b7ac1
font_01_sfnt_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 15880 bytes
SHA-256: fcdde1f6b22b8aa4cbbb15394d392081ef4a18ed2960713ec03f0060feadbdf3

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