Malicious PDF — malware analysis report

Static analysis result for SHA-256 161c515f87b56ba4…

MALICIOUS

PDF

40.4 KB Created: 2020-04-14 15:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e141a8da862a40154d81e5601c1215e6 SHA-1: 50fc23ab8d0e37375fca847f4fd50ac75b342ec3 SHA-256: 161c515f87b56ba47eaa90fb0b2f37444438a7ac830ab11a757aa8066e13ebf8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous external URLs points towards a phishing or SEO poisoning 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://myamazonuk.com/uploads/1/3/1/4/131407807/131407807.html#kset+online+application+form+2019
    • http://lifemattersyoumatter.com/uploads/1/3/0/7/130738991/dagikudol.pdf
    • http://progressivearms.com/uploads/1/3/0/6/130621776/melor_zixorazo.pdf
    • http://mentaltoneawareness.com/uploads/1/3/0/6/130620839/wepoledusejug_tonake_rexuje.pdf
    • http://shopitors.com/uploads/1/3/1/4/131453784/fd2374e82ae0ce.pdf
    • http://maria-cipriano.com/uploads/1/3/0/7/130739662/parobobapa-jasutaseliga.pdf
    • http://iamthaicuisinemi.com/uploads/1/3/0/4/130435666/tesas-gexojinamiki-moxatovelatim-mevuxadofeva.pdf
    • http://hamiltoncountylawncare.com/uploads/1/3/0/5/130551567/vupekapejojonuxoj.pdf
    • http://israelhighrisers-diy.com/uploads/1/3/1/6/131636789/2281693.pdf
    • http://gadsource.com/uploads/1/3/0/8/130814397/xebutikale_liwonorutim.pdf
    • http://kset.The
    • 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_off000075e9.bin
fceb2feeea977d2f86204388f505df08c1599c68c21c33fa86f6c335688026ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E9 8264 bytes

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