Malicious PDF — malware analysis report

Static analysis result for SHA-256 95776cd7574ed8d4…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 03:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea5c0425c86248d858b0d0e53a4775b0 SHA-1: 40f8ea054106a355667425dea29e779d6e6b68aa SHA-256: 95776cd7574ed8d466dea1658fc4ed17b1cc7713f4da1fdd6a331e2eda463611
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript and numerous URLs suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hzbmsj.net/images/upload/File/51001310714.pdf
    • http://hotechike.com/files/files/77819345941.pdf
    • http://self119.net/upload/userfiles/2021/09/files/210911061108.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52420ac4b---xusalugakuwewubarikuxifux.pdf
    • https://garraldaarquitectura.com/garralda_userfiles/files/xevovijalizotafuva.pdf
    • https://dejavuruse.com/userfiles/file/zopofimuwisuti.pdf
    • http://kzlo.pl/fotki/fotki/file/78924032866.pdf
    • http://guoyangmoju.com/userfiles/files/pikesutagurasekerujesomu.pdf
    • https://comillaspostgrado.es/userfiles/file/69333000208.pdf
    • https://tarsiman.ee/files/file/xenig.pdf
    • https://myclubowners.com/userfiles/files/25430229403.pdf
    • http://ed-union05.ru/files/file/dibuzivipapix.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/49008387685.pdf
    • https://sabunwangi.com/contents/files/83300191388.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/nurovimazajosibugitale.pdf
    • https://clubkdo.fr/img/pics/files/7548451023.pdf
    • http://geoodwierty.pl/files/file/41788174387.pdf
    • http://kingsauto-bar.com/js/upload/files/befumamesow.pdf
    • http://www.europesolidaire.eu/userfiles/files/wotelepowipu.pdf
    • http://zhouzhuanx.com/v15/Upload/file/2021911548299665.pdf
    • http://drairtools.com/ckfinder/userfiles/files/mokejasurila.pdf
    • https://maydangson.com/vietkiendo/upload/file/mulovewaredagavav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=transfer+files+from+android+to+iphone
    • 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_off0000c308.bin
bcf1e3b166c26b69b3b61d482de9c465c51d05c4acb6175926cecc6e61bc67e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC308 16936 bytes
font_01_sfnt_off0000ee05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 16792 bytes
font_02_sfnt_off0001061c.bin
56c54abcd6f1f80e0e264931506857eaffe61add7da466fc56c4cce1e1cd1275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 10724 bytes

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