Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae445d6fcd512f5e…

MALICIOUS

PDF

120.7 KB Created: 2020-05-31 15:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f85582ed48042ebc0ca9315c27dae88c SHA-1: b30ded175430ed6465c2d8739a39eec741cd3745 SHA-256: ae445d6fcd512f5ef9e6b3e5c3acb8d96571cbbf6a4a89f3b9a6afe7608fc5a7
94 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious with high confidence. It contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern, pointing to multiple domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://shrophshirecriticalcare.net/uploads/1/3/0/4/130435842/130435842.html#carlos+zarzar+charur+la+didactica+grupal
    • http://grantspreneur.org/uploads/1/3/0/8/130874498/vowozafub.pdf
    • http://diner-food.com/uploads/1/3/0/8/130814063/loritaxerejefi_risabafa_karidijif.pdf
    • http://floridianspac.com/uploads/1/3/0/8/130813652/9871828.pdf
    • http://texasqualitybengals.com/uploads/1/3/0/5/130539179/donuvizivosu-nuvesude-varenota-tuzen.pdf
    • http://schroederjeff.com/uploads/1/3/0/5/130540219/sadijakafovajomo.pdf
    • https://kikibok.files.wordpress.com/2020/05/romuzarapatinodovapogad.pdf
    • https://motonukem.files.wordpress.com/2020/05/60767699952.pdf
    • https://kitulularuzu.files.wordpress.com/2020/05/77393814949.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a44f.bin
2d84ae0636942eb5063defe9e2f34a76032a15a437a22af272f09e81a5429577		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A44F 1528 bytes
font_01_sfnt_off0001ac12.bin
1b89673bb9b688a294542e13cc01c38263917dd0a49e114013aa81520c140430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC12 12820 bytes

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