Malicious PDF — malware analysis report

Static analysis result for SHA-256 421dbba50e52ab69…

MALICIOUS

PDF

44.6 KB Created: 2020-06-05 21:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff87a0f8ea947ec4fe3c8b2e1fe2118 SHA-1: 2a02576162500ef2fbcc09ae9a8ed8547af50476 SHA-256: 421dbba50e52ab6911004a872fa40ccbbc51c1363452f859ea9870b572b01c8f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting a coordinated effort to redirect users to potentially malicious content or for SEO manipulation. The primary attack pattern involves leveraging these external links.

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://kwayonline.com/uploads/1/3/0/7/130739726/130739726.html#binomio+de+oro+quiero+que+seas+mi+es
    • http://northernrailleaders.com/uploads/1/3/0/8/130814407/e90fbd33d1d3.pdf
    • http://stagelife918.com/uploads/1/3/0/6/130604949/gemeguza_dabosirawisaviv.pdf
    • http://littlepeachfeet.com/uploads/1/3/1/3/131380470/nanifu.pdf
    • http://safenergy.org/uploads/1/3/0/8/130813644/9074932.pdf
    • http://mail.nscasa.org/uploads/1/3/0/7/130739509/45f153c6131b5b.pdf
    • http://droolresponsibly.com/uploads/1/3/1/4/131482993/55778bc8e1e5e48.pdf
    • http://a1049669xstreamtravel.xsideas.com/uploads/1/3/0/5/130589374/fusabebi_vogubutemafofe.pdf
    • http://elviraabrica.com/uploads/1/3/1/4/131407178/f35f280.pdf
    • http://cash4-home.com/uploads/1/3/1/8/131856546/nekujok-torokanumesez.pdf
    • http://hostmaster.nicksmusic.be/uploads/1/3/0/4/130488750/9508796.pdf
    • http://autodiscover.fosterenterprises.com/uploads/1/3/0/5/130551006/tuwomumovopin-nurediwixa-bozomunalafajop-nixuwes.pdf
    • http://kwayonline.com/uploads/1/3/0/7/130739726/terms.html
    • http://kwayonline.com/uploads/1/3/0/7/130739726/dmca.html
    • http://kwayonline.com/uploads/1/3/0/7/130739726/policy.html
    • https://vugikokawu.files.wordpress.com/2020/06/basigisakarederubumufod.pdf
    • https://sazojefos.files.wordpress.com/2020/06/9399935939.pdf
    • https://vinutogoj.files.wordpress.com/2020/06/49015543004.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_off00005fc1.bin
8f3c6ac098290535930a62471c59cc01db724254982e8b22b5293056f919eaaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC1 20800 bytes
font_01_sfnt_off00007f6a.bin
a0a3afe9262dbe3d7d89a918759fb0e6a3ed3df61ca5f348ffe0816343e42e2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6A 11848 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.