Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a77b6d9b0ec3a9…

MALICIOUS

PDF

31.6 KB Created: 2020-03-26 08:08:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d029ae3f4f20307b142be57896b0f25e SHA-1: 9ab629ae654b2c4e9b81f1ef8496cb45a9259823 SHA-256: f5a77b6d9b0ec3a952872930d653fe319388cc74795e253c0ccb0742e38a5fb5
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body itself is heavily obfuscated and contains references to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://vittoriomacchi.com/uploads/1/3/0/9/130969595/130969595.html#lyric+i+don%27t+care+i+love+it
    • http://kwikfixscotland.co.uk/uploads/1/3/0/6/130620353/biboju_bibofazolarul.pdf
    • http://youcanliveagain.com/uploads/1/3/0/2/130289803/nosijuwupile.pdf
    • http://blackfoxrealestatepartners.com/uploads/1/3/0/5/130550666/kagow-varufute-wokakevemelu.pdf
    • http://lowlogos.com/uploads/1/3/0/6/130620217/2864630.pdf
    • http://drodphotography.net/uploads/1/3/0/4/130475918/xawibavutowisup.pdf
    • http://landforsaleinlafayettecountyms.com/uploads/1/3/0/2/130292110/1433724.pdf
    • http://www.epicliving.rocks/uploads/1/3/0/4/130476736/20c17641c8.pdf
    • http://jonesfireprotection.net/uploads/1/3/0/2/130287513/01c707558afa.pdf
    • http://ecologicoonline.com/uploads/1/3/0/2/130289254/zebol_girowu_musopunewax_dalokebozidizug.pdf
    • http://www.mexicoluminaria.com/uploads/1/3/0/9/130969191/82dd3c3c75.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_off00005847.bin
7cd4202f758126eea9e47d427e1b72309b542a740ec21cadff0404ddef1478ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5847 6304 bytes

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