Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a624ac772576f01…

MALICIOUS

PDF

44.1 KB Created: 2020-03-20 08:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f80643b303d87d2945f2e3eb34f7a2cc SHA-1: 396f226fc4cf5e2b6aec22292bda82fc04fd48f5 SHA-256: 9a624ac772576f01e49681238600395622a99dc549c26270175fe9028983eb7f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, limiting the ability to determine specific payload delivery or execution methods.

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://app-pof.com/uploads/1/3/0/7/130776322/130776322.html#generacion+espontanea+cual+es+el+autor
    • http://livingpurewell.com/uploads/1/3/1/1/131164485/6393758.pdf
    • http://myqmunity.com/uploads/1/3/0/7/130739615/tujijisetolegof.pdf
    • http://www.jenniferbelphotography.com/uploads/1/3/0/6/130605397/1007013.pdf
    • http://der-orchideengarten.com/uploads/1/3/0/6/130639180/nutamewunex.pdf
    • http://detailerslist.com/uploads/1/3/0/4/130483852/e2925b129b.pdf
    • http://thepscfoundation.org/uploads/1/3/0/6/130621162/468377.pdf
    • http://mindbodyevolution.org/uploads/1/3/0/6/130620519/jizaloto.pdf
    • http://bowlingbergenopzoom.com/uploads/1/3/1/0/131070131/xerokaluwes_zilanubodi.pdf
    • http://theprivateerrestaurant.com/uploads/1/3/0/3/130323375/kepaseminegisugega.pdf
    • http://moldingyoungprofessionals.org/uploads/1/3/0/8/130814192/6279060.pdf
    • http://www.coachcousins.org/uploads/1/3/0/7/130774990/e2ea6c475.pdf
    • http://mrskramlsclass.com/uploads/1/3/0/2/130272350/afa1c375816.pdf
    • http://hong9zaixianyule.f18.ebkf.org/uploads/1/3/0/5/130539866/cf2d2e2.pdf
    • http://fourthdays.org/uploads/1/3/0/9/130969212/ribodurerume-pofugis-sivajexo.pdf
    • http://hostmaster.equilibriumtherapy.net/uploads/1/3/0/2/130291544/sebufotorag-tumag.pdf
    • http://justallink.com/uploads/1/3/0/6/130622110/f72dd.pdf
    • http://notariusz.sosnowiec.pl/uploads/1/3/0/2/130272420/dorotokaxupigi-gojujeferu-lutuv.pdf
    • http://mta-sts.mail.tuscanpta.org/uploads/1/3/0/8/130874521/tagesenoputuzuk-pogefodedisaf-bewalige-dovetapajemida.pdf
    • http://allenfoundationrepairpros.com/uploads/1/3/0/5/130588246/f305a4578f7884.pdf
    • http://mail.karripatchcottage.com/uploads/1/3/0/6/130605399/929989.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_off00008169.bin
a72d397f1727e88ca3f7e5a85f9a489e02d0544736bade3404faf9b852f5b0c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8169 8704 bytes