Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3358ce8e7bf8442…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 04:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b41b1eb31f58d84d051be55f602df1c5 SHA-1: 6925a76701c8dbf0a0b79ff0bf72b8bd29a934b9 SHA-256: b3358ce8e7bf844249d2b327f50729be51b3e76055aff1d118d0c5e22e07fb0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. Heuristics indicate this is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely a phishing or malware distribution attempt. The file's purpose is to lure users to click on these links, which could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.sushmitamukherjee.com/fckimages/file/64446750349.pdf In PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/nejodojodudaxifeva.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/55599007339.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/88399992006.pdfIn PDF document text
    • http://minhanh.com/files/25914632762.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/gobuguxopevetodujazuvosiv.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631935469.pdfIn PDF document text
    • https://digireg.nz/upload/12134390508.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/78517232040.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/39204298482.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210907224437.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/10869190321.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109061320053779058tnfm3.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a44992a9355d4653fa89b3b84f745468/31237985858.pdfIn PDF document text
    • http://www.celso.org/download/82643619513.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/nukelo.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/30469448674.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/zipemolutudagiwotekafusiw.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dh2oved3ugnsaafvbc9843e6o7/33061602703.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/88215511671.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/93175678827.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/79569638931.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/45465932310.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/nagam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=zakhmi+punjabi+movie+watch+onlinePDF 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_off0000c046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 10948 bytes
SHA-256: e58f283824dba0fca2a07890cfc26f201d826a6c6c055dc3833ef8f5aa042617
font_02_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 16588 bytes
SHA-256: b101fb79a2c8bf290c9d72949aecb07ee54d7f4f49e5050b82f802a7fd134a2a

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