Malicious PDF — malware analysis report

Static analysis result for SHA-256 a545ddb978ee4fec…

MALICIOUS

PDF

39.3 KB Created: 2020-04-01 17:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fdd68c3b238b25368767f469e12739e5 SHA-1: 57db9ce87355fd488d7f5d9031d121f3b5a331ab SHA-256: a545ddb978ee4fec807c125676423b5f4bdaa5fa7c9e29a1d68baa786c7955bf
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 PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a network of linked content, potentially for SEO manipulation or to serve as a distribution point for further malicious payloads.

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://randomfisherman.com/uploads/1/3/0/2/130289173/130289173.html#abre+los+cielos+hoy+acordes
    • http://easybillpro.com/uploads/1/3/0/7/130776007/lubim.pdf
    • http://californiacreativecounselingcenters.com/uploads/1/3/0/5/130539099/998825.pdf
    • http://myleansolutions.com/uploads/1/3/0/3/130379204/vowufebikeg.pdf
    • http://hauload.com/uploads/1/3/0/5/130545327/9257b95fc1.pdf
    • http://emergingpursuits.com/uploads/1/3/0/7/130776015/navukimuw-komapumofaro.pdf
    • http://sistemasfta.com/uploads/1/3/0/5/130589267/faxojozimer_zarimesapibunij.pdf
    • http://urmomcast.com/uploads/1/3/0/5/130588370/jelez.pdf
    • http://uniquefitsique.com/uploads/1/3/0/5/130543293/napiki.pdf
    • http://spiritgirloracle.com/uploads/1/3/1/0/131070767/pekesifututatal-rivujupavil-makaninixala-lobalafur.pdf
    • http://americanmusicnews.com/uploads/1/3/1/4/131438187/c5696a.pdf
    • http://josephmclachlan.com/uploads/1/3/0/5/130588232/4321908.pdf
    • http://jennysinlex.com/uploads/1/3/0/3/130313507/wulupedigores_zefonapesegigan_gijikirugu.pdf
    • http://lostemidos.com/uploads/1/3/0/7/130775870/zilokevo.pdf
    • http://ulamerica.com/uploads/1/3/0/5/130539728/losafebuzodisot.pdf
    • http://lolihairstudio.com/uploads/1/3/0/8/130874284/debupaxekin_borulexubudox_galiv_ziwoxudewo.pdf
    • http://jhtour.net/uploads/1/3/0/2/130273578/7434569.pdf
    • http://normanfoundationrepair.com/uploads/1/3/0/5/130588865/5925247.pdf
    • http://artimpact.org/uploads/1/3/1/1/131164393/rokunagosu.pdf
    • http://hkscmi.com/uploads/1/3/0/4/130483355/3190849.pdf
    • http://lotusventura.com/uploads/1/3/1/0/131071231/genid_gemuter_dovixale_faxotugiwote.pdf
    • http://canadavisaoffice.net/uploads/1/3/0/3/130313135/wanogaw_wivep_kovadose_kixageburoba.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_off00006c17.bin
385323e417780bbaf47bc14ec989c1224b45493ae97a655a56cc2bbf80323c04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C17 9528 bytes

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