Malicious PDF — malware analysis report

Static analysis result for SHA-256 030ffd4a989758ea…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 15:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0fd83e25507b3f5b9bbc89943515fc8 SHA-1: 7574665c350c287f639cbd8da977ce88db7f6e1b SHA-256: 030ffd4a989758ea2d8a9d31481ba23a667542424a98635f98eb96408780e159
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a phishing or SEO poisoning attack. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

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 https://typeone.com.my/ckfinder/userfiles/files/wezitope.pdf
    • http://superazs.ru/images/news/file/7899582132.pdf
    • https://hotelcorona.ro/files/15579181795.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/38586355463.pdf
    • https://reniuved.it/file/93291781270.pdf
    • http://kukdae.com/files/fckeditor/file/8752038708.pdf
    • http://ldksolar-officialliquidation.com/userfiles/files/69539256888.pdf
    • http://crabandclaw.com/uploads/files/40778145765.pdf
    • https://marikakozmetika.hu/editor_up/vunujixu.pdf
    • http://wingtsunkungfu.ro/imagini_ws/gilejolasetelibefubudira.pdf
    • https://egf.tw/test2/images/file/vojirolasidej.pdf
    • http://messtores.ca/fck_user_files/file/zidadejaluvoxigexugob.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613825ff78f07---37109491974.pdf
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/xotigagugebivu.pdf
    • https://wemservice.com/ckfinder/userfiles/files/33137125751.pdf
    • https://pgp-puh.hr/fck_media/file/zatosap.pdf
    • http://thumpamonpally.com/userfiles/file/49706469029.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a7c9f685---puzuzofonoxeto.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kifaruvew.pdf
    • https://lee-trading.tw/archive/upload/files/10668112087.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/sekerotuvidelo.pdf
    • https://ooobelkom.ru/ckfinder/userfiles/files/66560020218.pdf
    • http://grandfiltr.com/files/file/xigijikelotufeviwoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=moto+games+online+free
    • 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_off0000dad2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 16792 bytes
font_01_sfnt_off0000f2e4.bin
ca7b298db7d21eaec15998e6e34fc81460dea0c99ae06d658419a570381cede4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 17668 bytes
font_02_sfnt_off000120bb.bin
8194cc1ce5c04538f51e3b374eedf21cb29fa6f7aecb2e361a30f2b707d56749		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 10548 bytes

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