Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1f92166eba2ce7…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 19:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e12df096ef9a8f1924b09b9b6aa0baf SHA-1: 50d8cb620b0ae6bd1611bd3cbcbdb3d4f75c24e0 SHA-256: ab1f92166eba2ce781e003f5e58ca7f16e1b7a92b01dd789ed83397269d699dd
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The document functions as a link farm, presenting numerous URLs that lead to other PDF files, suggesting a multi-stage attack or a method to distribute further malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://k12kos.com/ckfinder/userfiles/files/94218280610.pdf In PDF document text
    • http://mamtaniketan.com/userfiles/file/delanokowabaroz.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/vaperulit.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/mugurunak.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/sajunenarirutagalasinulap.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614580673171f---jilaloborubivukasamav.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/41299843352.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/tiwavoranurupukekuzizuv.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/jaxawunediji.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/53179993761.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/najabuxatelewivuf.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090606502173499.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/bobumowexoxusexalowomebo.pdfIn PDF document text
    • https://mcgbaharat.com/userfiles/file/73078354713.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/kizelitozilekolibowit.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/jugakuzunokek.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/gosonufuladuxix.pdfIn PDF document text
    • https://labelmarket.pl/data/file/30142954665.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/74703486151.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091409575097.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/34561973659.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/35936281226.pdfIn PDF document text
    • https://bolahijau.com/contents/files/lisoxadibilosakawafug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=maths+1st+puc+textbookPDF 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_off0000b082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB082 14468 bytes
SHA-256: a7438921d79034a603198669b74e1db020b37357ff73ec58eca4d806c4bb729c
font_01_sfnt_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 10608 bytes
SHA-256: ce18a02ec7a3c5545dce2e3a18059645412ae39af2cbe75b0e460529eba032c2

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