Malicious PDF — malware analysis report

Static analysis result for SHA-256 7344117d4c43bea7…

MALICIOUS

PDF

77.7 KB Created: 2020-06-09 09:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a5fc08962b1c1a323c0f3d9bc5c1b9d SHA-1: 373b6699cd4e0a9074a9a6ac407d8dfd9ea43ab8 SHA-256: 7344117d4c43bea7310c9bf063915cb46c0497ed3fc6b59134692bae0b5f10e9
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, suggesting a link farm or redirection to malicious sites. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. No scripts were extracted, but the presence of numerous external links points towards a phishing or content-luring attack vector.

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://201.bpmtc.com/uploads/1/3/1/4/131406356/131406356.html#o%25C4%259Fuz+atay+tutunamayanlar+ka%25C3%25A7+sayfa
    • http://bekascabe.org/uploads/1/3/0/6/130621485/1924565.pdf
    • http://docuvoicesa.com/uploads/1/3/0/4/130477090/413dbe05f3.pdf
    • http://candjelitecleaning.com/uploads/1/3/1/0/131071231/nalaxonefexubok.pdf
    • http://spilledbeanscoffee.com/uploads/1/3/1/4/131455158/d2ca6eab8fe514.pdf
    • http://hollywoodgardens.net/uploads/1/3/0/9/130969814/839298.pdf
    • http://exmouthcaninecentre.com/uploads/1/3/0/5/130551135/pogubolep.pdf
    • http://sportsbands.com/uploads/1/3/0/7/130776241/belugugug_dolilesib_tabotezegofosoj.pdf
    • http://store.jenndepaola.com/uploads/1/3/0/5/130539092/fefuzalet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kovevaso.files.wordpress.com/2020/06/doker.pdf
    • https://gamekupori.files.wordpress.com/2020/06/64720042111.pdf
    • https://revipob.files.wordpress.com/2020/06/84565706970.pdf
    • https://lotodirod.files.wordpress.com/2020/06/21693921364.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e755.bin
9b40056dcf21b4ae7e03b80a390a1af2860ae838f35be20725788e6e2c42cc53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 14448 bytes
font_01_sfnt_off0001135f.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 16204 bytes

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