Malicious PDF — malware analysis report

Static analysis result for SHA-256 150981e9c6c13283…

MALICIOUS

PDF

45.0 KB Created: 2020-04-01 19:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce411202c2172ebf4fe1c8268553aa1d SHA-1: ae93dde9c0054c970bf2a0a9eb60ae34042436be SHA-256: 150981e9c6c132836329a3b64e70f90c2e08fcf3ec18a5caa2fc6eea608b2546
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by an ML classifier as malicious. It contains a large number of embedded external links, suggesting a link farm or SEO manipulation tactic. The primary URL, http://hopsafe.co/uploads/1/3/1/4/131437977/131437977.html#libros+sobre+tecnicas+de+estudio+para+adolescentes, and numerous others point to PDF files hosted on various domains, which could be used to distribute malware or lead users to phishing 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://hopsafe.co/uploads/1/3/1/4/131437977/131437977.html#libros+sobre+tecnicas+de+estudio+para+adolescentes
    • http://peninsulapopsconcerts.org/uploads/1/3/0/4/130490808/673a9193.pdf
    • http://knowledgeoftheword.net/uploads/1/3/0/9/130969871/botugovijixoganapa.pdf
    • http://fetas.accessazores.org/uploads/1/3/1/3/131379643/f3bee3dfb37.pdf
    • http://10maincenter.com/uploads/1/3/0/9/130969645/nusabovod.pdf
    • http://jenniferhelsper.com/uploads/1/3/0/9/130969001/renitej.pdf
    • http://artcoven.com/uploads/1/3/0/6/130621721/7251814.pdf
    • http://pstdelevation2017.com/uploads/1/3/0/5/130539757/9265867.pdf
    • http://listmomla.com/uploads/1/3/0/7/130775053/68a1b3197.pdf
    • http://mthomeimprovements.com/uploads/1/3/1/3/131383914/1553a0f93.pdf
    • http://nickandsam.net/uploads/1/3/0/4/130476385/2842378.pdf
    • http://onkarvoyages.com/uploads/1/3/0/2/130272955/7d0fe.pdf
    • http://janobaltimore.com/uploads/1/3/0/2/130288455/faxipilidagare-nogeradad-vasariluxinu-rezebo.pdf
    • http://massrealestatewholesalers.com/uploads/1/3/0/7/130775518/ludigajowobigag-gopep-kupeguvu-purun.pdf
    • http://www.thedollhousellc.com/uploads/1/3/1/3/131383318/7ac6a242c.pdf
    • http://bensonforhouse.com/uploads/1/3/0/6/130621148/0ed6e02fd6.pdf
    • http://pillarsofsilence.com/uploads/1/3/0/6/130639396/kukutifin-duleno-kezuvejag-lujed.pdf
    • http://sassyscentsandbling.com/uploads/1/3/1/0/131070001/webopalibofe.pdf
    • http://byelliott.com/uploads/1/3/1/4/131438483/943174c976.pdf
    • http://utfarmmeats.com/uploads/1/3/0/7/130739781/lavogudosusobuvuz.pdf
    • http://donaldmingo.net/uploads/1/3/0/3/130313035/b897a71b1.pdf
    • http://klovsjoklovsok.org/uploads/1/3/0/4/130476740/3f3e1da3deb268.pdf
    • http://neilmcdonald.info/uploads/1/3/1/4/131483685/wapenobogis.pdf
    • http://clairebaconagility.com/uploads/1/3/0/5/130546294/tuxalepetezin.pdf
    • http://contractor-pm.com/uploads/1/3/0/9/130969229/nugimonu.pdf
    • http://itsmeforyou.com/uploads/1/3/0/5/130590741/nozefumefon_jivadevepaxibu_nukar_vajafuje.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085d6.bin
b54f5db40a08d4e42e4505228648f41e6fd03b99cce8fc4e9ca837abebc55bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D6 9008 bytes

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