Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9bea8a81316035…

MALICIOUS

PDF

34.7 KB Created: 2020-05-13 13:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8d039da5cfaacc42739fb260988d8917 SHA-1: 9775fac133197dca0f42b5f1b733f19112aedb70 SHA-256: 0b9bea8a81316035ab8ba7830fb37c5f49c077a33c02957ac6d54f96b6bae4e1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. This suggests the document is part of a link farm or SEO poisoning campaign, designed to drive traffic to malicious or deceptive content.

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://shestylezbyjene.com/uploads/1/3/0/6/130620443/130620443.html#local+tv+guide+appleton+wi
    • http://montourridge.com/uploads/1/3/0/5/130550657/989b65da3f5aa.pdf
    • http://episcopalchurchmediator.com/uploads/1/3/0/7/130738902/3675087.pdf
    • http://alphaalienz.com/uploads/1/3/0/6/130621446/nilel_luvixuwofefo_dajefe.pdf
    • http://carcehistorynerd.org/uploads/1/3/1/4/131407281/xojigerataxexo_mimekotu_lipasukan.pdf
    • http://powerbicollege.com/uploads/1/3/1/3/131398145/c589dd17.pdf
    • http://313designs.com/uploads/1/3/1/4/131406071/zuzinina.pdf
    • http://anikah.co/uploads/1/3/0/6/130620888/zuxafezuxetew_zezulexivereti_jawerojeber.pdf
    • http://davenportishome.com/uploads/1/3/0/8/130813999/388ab88bef.pdf
    • http://euro-tres.com/uploads/1/3/0/8/130874608/pawufipagebexesine.pdf
    • http://earthdiscoverycorp.com/uploads/1/3/0/2/130271126/weref.pdf
    • http://tienichnho.net/uploads/1/3/0/2/130288510/vedepivigal_wutumerele_dedanidimu_gosunadobes.pdf
    • http://debrios.com/uploads/1/3/0/5/130551597/kivuxesukime.pdf
    • http://laurenbillingsley.com/uploads/1/3/0/6/130620968/gavume-xapoletisomaxi.pdf
    • http://ten18international.com/uploads/1/3/1/3/131383398/3581d3917.pdf
    • http://schallisflyfishing.de/uploads/1/3/0/6/130603928/5502956.pdf
    • http://nicecleanjanitorialsvc.com/uploads/1/3/0/7/130776022/besunupilogawad.pdf
    • http://santamariagestioninmobiliaria.com/uploads/1/3/0/7/130775214/jibifekogajonorigege.pdf
    • http://larueatelier.com/uploads/1/3/0/2/130271209/wefowurotinuz-sibodinib.pdf
    • http://eagleautofm.com/uploads/1/3/0/2/130287940/dexujulas-lurikematuza-sojakusaduxipub.pdf
    • http://arnhemsewijnimporteurs.nl/uploads/1/3/0/7/130739117/9963922.pdf
    • http://elementz.eu/uploads/1/3/0/4/130436122/9378319.pdf
    • http://joannturner.co/uploads/1/3/0/6/130639428/3690648.pdf
    • http://opuscs.org/uploads/1/3/0/2/130270887/kogosewojejujev_xebelajazan.pdf
    • http://silverlynxevents.com/uploads/1/3/1/4/131438641/3583084.pdf
    • http://heavenonearthhealth.com/uploads/1/3/0/7/130739853/zewasevu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e0c.bin
c1e6d8f8beaddf6e6cab8de81e02fae4dbe96f02dfae29d7d2c5699578b1e6b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0C 9512 bytes