Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e50d6ca6f61babf…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 22:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22576766401273714b01bd102d6dc56d SHA-1: cffdcc6b9b1e6fb25de75a08dfb48c1fdb3f3bb5 SHA-256: 0e50d6ca6f61babf1c10fc249188bfc202a68e9863819e55753b9a3f26b01c9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on disposable domains or appear to be part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. The presence of external URIs suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=compass+apk+without+magnetic+sensor PDF link annotation
    • http://mariekevanvlierden.nl/survey/userfiles/files/80252553477.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/43776289298.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/kinelujorum.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/76851603236.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210909_163802.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/53939166812.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/fozinivu.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/46530083987.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/66446105192.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/niwumufamugofu.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/rexitoritifa.pdfIn PDF document text
    • https://seerupit.dk/assens/file/gogal.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/dogagafoxase.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/99987715096.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/lolokukimoga.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/babagoje.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1d6ca1b2f2e329aeb0d9251a459e64e5/77606778813.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/50633667056.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/48307112104.pdfIn PDF document text
    • http://baoveantam.info/upload/files/65553440301.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/93406622516.pdfIn PDF document text
    • http://rhondachem.com/d/files/21423846409.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/39409546489.pdfIn PDF document text
    • http://reylab.com/userfiles/file/80037744852.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_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 19764 bytes
SHA-256: e23be937fa2ed04027e6d37ef39d27af7191dd59300a25ddb388aaf54f8a8536
font_02_sfnt_off00013773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13773 11084 bytes
SHA-256: d11520c66176439444d73e93f67ad4aaa3bc354eec2e91f67dcb274e7e0eb434

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