Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fa88131ee44fbd…

MALICIOUS

PDF

32.4 KB Created: 2020-03-13 05:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 743fa2a5aa4fda40fe3cb809b89ffe66 SHA-1: 1024a55d009a7940d6e0e63c14a1a284acb934c9 SHA-256: 69fa88131ee44fbd0f0a3e0cf0b55f2d8aa74786ede221b4c213aa7491adebf0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure shows duplicate object bodies, suggesting potential obfuscation or malformation. The primary intent appears to be directing users to a wide array of external sites.

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://nomorejoemoore.com/uploads/1/3/0/5/130543020/130543020.html#acls+precourse+self+assessment+quizlet+pharmacology
    • http://gosrent.is/uploads/1/3/0/8/130813988/6793038.pdf
    • http://lenderlori.com/uploads/1/3/0/5/130551920/3237947.pdf
    • http://sportspilates.se/uploads/1/3/0/2/130288383/metebuminu.pdf
    • http://plantdrpeter.com/uploads/1/3/0/7/130775889/xupijiwozabega.pdf
    • http://decentralizedboutique.com/uploads/1/3/0/2/130272853/25bad2cd5cd.pdf
    • http://chaoyue.video/uploads/1/3/0/3/130324203/terodikef_jilutikevip_wovazeviwof_dolubakizonibi.pdf
    • http://nexusintouch.com/uploads/1/3/0/6/130640116/figazaxolis-xadujulan-mixejinuladutov-kamexeku.pdf
    • http://www.totembliss.com/uploads/1/3/0/8/130813948/6015113.pdf
    • http://santangelopainting.com/uploads/1/3/0/5/130540063/2950313.pdf
    • http://northtexasdoodles.com/uploads/1/3/0/4/130476262/naninepugar-rogoxop.pdf
    • http://goodvibesdesign.com/uploads/1/3/0/5/130551726/1e2b9.pdf
    • http://www.empoweredbysam.com/uploads/1/3/0/3/130323271/depodutegabatipana.pdf
    • http://themiraclemedley.com/uploads/1/3/0/6/130604894/soxuwovemonogu-sonuvotujofoko-benunogemadid-jewivifeda.pdf
    • http://www.iamuiuc.com/uploads/1/3/0/5/130551000/4681805.pdf
    • http://beleeflaos.be/uploads/1/3/0/2/130272905/1146944.pdf
    • http://navamtech.com/uploads/1/3/0/5/130551597/bunubogomuxu.pdf
    • http://www.masca.org.au/uploads/1/3/0/7/130738991/wimanejigizevus.pdf
    • http://staceymbrown.com/uploads/1/3/0/4/130476024/097951fa1fd.pdf
    • http://mail.invernessvineyard.org/uploads/1/3/0/3/130312925/9fe72c5dc0f3b8f.pdf
    • http://www.gamerxserver.net/uploads/1/3/0/7/130775623/gevup.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_off00005a96.bin
b9c4617d6adf1954963971a5f4ec2a85977cbda9888912f7c519a509127e8c1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A96 6392 bytes