Malicious PDF — malware analysis report

Static analysis result for SHA-256 c195bfc5c14e015f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 15:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 686263d5d0a35c32ae2bb00195215a7b SHA-1: 2ae27a7725f44a4156a662ba6853cd2002a5b758 SHA-256: c195bfc5c14e015f727cf156af7ff5b9805ccd50e9e32f53de72fb57d4d6378b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The primary purpose seems to be directing users to potentially malicious or scam-related content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lgassociates.in/uploads/jusunimekaveme.pdf
    • http://signauction.net/userfiles/file/55364927069.pdf
    • http://duhochoangthanh.com/upload/files/34331614851.pdf
    • http://fractinvest.com/uploads/file/58563148201.pdf
    • http://softtox.pl/new/userfiles/file/lawomawotezorusavizatim.pdf
    • http://sloplast.com/userfiles/files/kevib.pdf
    • http://dzstock.com/Upfiles/file/pajamaredizuniwiv.pdf
    • https://cmflower-kkc.com/ckfinder/userfiles/files/64497247917.pdf
    • https://vicotelecom.vn/static/source/images/file/kemajowagefefog.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/17147722281.pdf
    • http://zhfangyuan.com/uploadfiles/files/muvoripumisifadamek.pdf
    • http://sangjeom.com/userfiles/file///48396700217.pdf
    • https://marbeyoyun.com/calisma2/files/uploads/tiribitodiforo.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161302cad2fa38---57731111063.pdf
    • http://siamsankyo.com/Uploads/file/kemazebogefumosemakoji.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/89664889284.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/84775151669.pdf
    • https://bfull.ru/uploads/files/begogugixuneniz.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/nerekuxafef.pdf
    • https://granitabrasive.com/editor_up/kipubaxetapixafiwilapig.pdf
    • http://www.truca-taoules.com/ckfinder/userfiles/files/gimunosuwubujigavemor.pdf
    • http://daming-school.com/userfiles/file/gubivikodoz.pdf
    • http://konikanarrowfab.com/ckfinder/userfiles/files/zibawoxegomibu.pdf
    • http://kmconlinecme.com/userfiles/file/83475516850.pdf
    • http://campingwithconvenience.com/files/files/goliguwobodewutisa.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/suzeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=free+avi+video+converter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5fa.bin
04edc7e4bb797e02db4cb1b4c4c41a9356383ac0d3122e207f3edbfcdba607b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 10192 bytes
font_01_sfnt_off0000ece5.bin
e55585d4e539a0a741b35c7e4e218daef38bf3fe72e4eddbc065c10b207c4f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 18004 bytes
font_02_sfnt_off00011b06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 16792 bytes

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