Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b0971b9a4ee73c…

MALICIOUS

PDF

39.0 KB Created: 2020-05-20 02:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f08c228a9a7477be7b14b2c78b46dcf SHA-1: 33b34fce41a6cb6f94c3a1deea21fffbc2543700 SHA-256: 68b0971b9a4ee73c6220bdf5cffd48a67a91ee4cfec7385ae70f70d98147060f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is identified as malicious by an ML classifier and contains a large number of external links, many of which point to other PDF files. The document body suggests a lure related to 'Simulador de word 2016'. The presence of numerous external links, particularly to other PDFs, indicates a potential SEO poisoning or link farm tactic to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the heuristic firings strongly suggest a malicious intent related to link manipulation and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://francescocamuglia.com/uploads/1/3/0/7/130740166/130740166.html#simulador+de+word+2016
    • http://kelseywatts.com/uploads/1/3/1/4/131407901/gerodimexidududazike.pdf
    • http://scottrosenthalphoto.com/uploads/1/3/0/4/130476385/rarifozexositijaxo.pdf
    • http://apg-security.biz/uploads/1/3/0/3/130323592/f785a8e62a33.pdf
    • http://thechristiangiftshoppe.com/uploads/1/3/0/7/130776356/wisokajes.pdf
    • http://scuwibblog.com/uploads/1/3/1/6/131606844/f36932.pdf
    • http://izotza.com/uploads/1/3/0/7/130738753/b49e9.pdf
    • http://maescarpetcleaningcharlotte.com/uploads/1/3/1/4/131453354/6117693.pdf
    • http://wiretheworldnow.com/uploads/1/3/0/5/130589121/7075425.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e73.bin
fadf5156028cb1d3e1036864ffe3be99c72ed29d6e2b7b147a8df3e58a2075d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E73 21916 bytes

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