Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f4a5f5fadf2e03…

MALICIOUS

PDF

33.3 KB Created: 2020-06-02 23:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58d40ed74392ecdbf96d4ff984235620 SHA-1: a571f9b9a30f3821090d53b5ea0d050406b24ea7 SHA-256: 77f4a5f5fadf2e03316ef835ff3cac56bc6f0c6d036e9d3adba0fa1c9178d03c
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which are likely part of a link farm or SEO manipulation scheme. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and heuristics suggest an attempt to redirect users to potentially malicious content hosted on these external 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://colonialtransportation.org/uploads/1/3/0/7/130776096/130776096.html#ang+probinsyano+april+13+2018
    • http://sognvegteneste.no/uploads/1/3/0/6/130604036/riterokawaxiwig.pdf
    • http://garollagranola.com/uploads/1/3/0/4/130483275/1197443.pdf
    • http://wizardswireless.com/uploads/1/3/0/5/130588939/2227055.pdf
    • http://colonialtransportation.org/uploads/1/3/0/7/130776096/terms.html
    • http://colonialtransportation.org/uploads/1/3/0/7/130776096/dmca.html
    • http://colonialtransportation.org/uploads/1/3/0/7/130776096/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://lizirak.files.wordpress.com/2020/06/pobularuroxozu.pdf
    • https://nawekogozus.files.wordpress.com/2020/06/73659007352.pdf
    • https://fugebetowipo.files.wordpress.com/2020/05/jewitozegelolela.pdf
    • https://dutubigibud.files.wordpress.com/2020/05/soramasisijesi.pdf
    • https://zasolifi.files.wordpress.com/2020/05/82556197310.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005969.bin
2d36b3a80f1512263f265b3112b593e42d9464a4624f04d81eb54e4ad782b0e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5969 9548 bytes

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