Malicious PDF — malware analysis report

Static analysis result for SHA-256 619a636ea1280152…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 17:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e897f06f0afb8da68c9e2a01bed52f3 SHA-1: d27d2756f5815de068e7274f055dca61c5a4e841 SHA-256: 619a636ea128015265524542ecc210fea1d8a6faa1b3f7dfcd0406b835981680
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL analysis point towards a malicious lure.

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 http://vibrator4you.cz/UserFiles/File/mamokudiw.pdf
    • http://gniortho.com/files/Upload/file/riputolonosubabi.pdf
    • http://cuacuontoanthang.com/media/file/34373378236.pdf
    • http://olivetheater.com/userData/board/file/2003939844.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/68728480151.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161353dfb113ec---79024470417.pdf
    • http://mastervin.ru/files/file/29708307850.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/gusukewikuvupajawo.pdf
    • http://www.allatpatikapecs.hu/images/file/46635696306.pdf
    • http://bularz-auto.pl/images/userfiles/file/22563756834.pdf
    • http://analhospital.net/file/files/madodupi.pdf
    • http://starma.pl/files/file/16466428980.pdf
    • http://stisk.com/file/lenazozamukodutepuwevo.pdf
    • https://powermailer.in/userfiles/file/88137514442.pdf
    • https://profitaler.com/UserFiles/file/4987265181.pdf
    • http://greenvisioninternational.gm/userfiles/file/mibaw.pdf
    • https://sportyou.fr/ckfinder/userfiles/files/sisuvezumagovilabonos.pdf
    • https://travelworld.ro/userfiles/file/gawukefo.pdf
    • http://ues-rb.ru/themes/ues-rb.ru/files/lulizexenolunuz.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/bofumuladozisi.pdf
    • http://lovesenergy.nl/file/10613383884.pdf
    • https://romalasergroup.com/userfiles/files/38304249772.pdf
    • http://residenzaeden-albisola.com/userfiles/files/84270024557.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+city+cheat+unlimited+gems
    • 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_off0000dfab.bin
f2a070274e711c113d5c35131ed0bf7f322a338c8306c93152f34e5512328125		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 17440 bytes
font_01_sfnt_off00010cf5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 16792 bytes
font_02_sfnt_off0001250c.bin
f6999e3415da8fa856ee73385289d149f14aef58c792dd49d75142726cbac571		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 11032 bytes

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