Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada547b02df2acc8…

MALICIOUS

PDF

33.1 KB Created: 2020-04-13 09:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b9c80c87aa643bdb63b57a4a876d1e7 SHA-1: 67cefdf0902f1ed7db9ad5de6426f7fbdd6a5649 SHA-256: ada547b02df2acc8c0146aee70a7d2c81bdfd0b017c5443575c48daf7e3c166e
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to a manual and URLs that are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ameenahsan.in/uploads/1/3/0/6/130639624/130639624.html#badger+5+plus+insinkerator+manual
    • http://digitalcadaver.com/uploads/1/3/0/8/130813483/1818822.pdf
    • http://norwichmedievalmysteryplays.com/uploads/1/3/0/7/130738970/5919194.pdf
    • http://yuboip.com/uploads/1/3/0/2/130287883/pivasiluj-tawodazuloz.pdf
    • http://anew3ra.com/uploads/1/3/0/2/130270982/cd569287af7.pdf
    • http://skinspiritlife.com/uploads/1/3/0/9/130969403/2f8726e55d.pdf
    • http://connectionsathome.net/uploads/1/3/0/9/130968968/9856282.pdf
    • http://supplychainng.com/uploads/1/3/1/4/131407424/kuluzirudafosi.pdf
    • http://t84.dk/uploads/1/3/0/2/130289418/f76e04a799a1.pdf
    • http://alexeliasof.com/uploads/1/3/1/3/131380094/ffce1.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058d5.bin
8c63692edf04731e427db796f00282f294ce66d5f55ddab0345caeea11f61f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D5 8168 bytes

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