Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cf43d59474ac81…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 15:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: ce985c015219af561003e2370aa23534 SHA-1: c747d73b29bcbc18cf7cd3650fab833a53dc4c84 SHA-256: 01cf43d59474ac81b616e2cd4e73da397704a01d2c08516b1859b82d21d513ec
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 0.9980

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://theofficefurniturestore.com/ckfinder/userfiles/files/68463769317.pdf In PDF document text
    • http://s4l.vn/storage/ckfinder/files/33819442244.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/soxofupalowek.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/82529486583.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/10704229466.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/woxuwupofevajimejas.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/rijuw.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/maloxatoluwodusag.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/wisojosorop.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/kenizib.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/javawo.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/87859874055.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/73498050088.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/38936515450.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/77114360068.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/zakolexip.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/sutoroxuzipiwir.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/22451036190.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/zizubowosajafapa.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/13468825338.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/mesurusad.pdfIn PDF document text
    • http://schokobrunnen.com/idata/48601472207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=super+mario+bros+ds+downloadPDF 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_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 10856 bytes
SHA-256: 8465a9cdbc2bbf6ac219234b7ae65443d8f66f4bdd53c357709030298c385dd9
font_02_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 16820 bytes
SHA-256: 670deef62795500f9b660862409930afaddcb7168600c61f1677801b820d4f04

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