Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c70a48676957b0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 05:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13488228a575d4bd2650a135226f381b SHA-1: 421ca45aae0e9456e85b5ff89c6000995d6304d4 SHA-256: e5c70a48676957b0eaa313a1f640d91135b046b1baa75b544600550f7bdc7523
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'SE_QR_LURE' indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=qr+code+app+apk PDF link annotation
    • http://budka39.ru/files/dajobofebovupifa.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/bazosibikabofaximop.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/19116975198.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/zepazu.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/xizip.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/15569213860.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/watiwutoxusodu.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/10501973273.pdfIn PDF document text
    • http://compsult.net/userfiles/file/6404036313.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziwawalufusafube.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/xegipatarosinefilag.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/sitafiregevatajezetava.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/32324377874.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/4521862968.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/bokef.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/62918813963.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zegoxejoxezi.pdfIn PDF document text
    • http://school15-tyumen.ru/f/wujasamemenosigesu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614696365a76e---pazizejutajiwe.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/jixinovizovekawutema.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/66107337592.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210904113120.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210916/16317354981504.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_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 18412 bytes
SHA-256: ffcddc1b45da1c9a55744d65f4f0cfc9aa6c9982d1ca13db810d7c30e733a114
font_02_sfnt_off00012d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D05 10148 bytes
SHA-256: 7fd5dc563d475e6825e79ca3df994ea7a67e4604131c21f9580ff544c0eed3d4

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