Malicious PDF — malware analysis report

Static analysis result for SHA-256 253298abe51e0801…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 22:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35bda28c9f22624d79ede832076ff827 SHA-1: 16d3d1f5b0548c7b60361442def39fbfe3bd884d SHA-256: 253298abe51e08014da6144e085163ee7e3f1fa5f00d8f29ade0e9b1c8fb5059
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://traiteurluc.com/userfiles/file/jilevu.pdf In PDF document text
    • http://elmbbq.com/uploads/files/54483931617.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/24417740180.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/vujuwumukevofavi.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/38797732364.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/foperalafogamolegugodem.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/fomosudu.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210912_CA7AA649E24D0219.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/11137417706.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/bokonilajaz.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/rukizu.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/53884208160.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/18979004495.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1lt75lpusqunfe1jnjkrd2vkn0/misovixojulamilojebek.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132273a14cd1---riwokikokusimemon.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/taburizosesogur.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/85538313978.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/87991311807.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/nipedufa.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/livezonu.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/lugomabenat.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/rezosovu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/naweba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=c+programming+book+for+beginners+pdfPDF 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_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 10960 bytes
SHA-256: 824ac859967a83757733ca4f18bd787989d192f4311dffae0ec0a5f37846d645
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 17784 bytes
SHA-256: 0c6b8792502fbb4f43a8bbc79223ae362910b831a0e62779725eb0a33fcb4d03
font_02_sfnt_off00012a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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