Malicious PDF — malware analysis report

Static analysis result for SHA-256 104c40b7313549ed…

MALICIOUS

PDF

42.5 KB Created: 2020-07-02 04:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fe08ddaa8822e645bbd73884ba109a6 SHA-1: 90bea0afefd745effd43cb6681bc4e7aa8fe9d83 SHA-256: 104c40b7313549ed274d151a599737fcc1aaf3142f4145b12bc5b80ae4e9cdd7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attack. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs pointing to other PDF files indicates a likely attempt to distribute malicious content or manipulate search engine results.

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://files.ucdavisxctfclub.org/uploads/1/3/0/6/130603802/130603802.html#berklee+performance+center+boston+ma+seating+chart
    • http://k-laser.eu/uploads/1/3/1/3/131384611/4059294.pdf
    • http://files.dmcihomessales.com/uploads/1/3/0/2/130273753/2445304.pdf
    • http://mx.dianapishnerwalker.com/uploads/1/3/0/7/130776756/2814593.pdf
    • http://hostmaster.kidwellybowls.com/uploads/1/3/0/6/130604312/9234830.pdf
    • http://mta-sts.lanefchocolate.com/uploads/1/3/0/6/130604621/749aafda88.pdf
    • http://buahnagaq.org/uploads/1/3/0/6/130639268/vexipaxufukinud_kovaz.pdf
    • http://changingfaceshairandmakeupartistry.com/uploads/1/3/0/2/130288642/d21f59fca8c1b.pdf
    • http://endoflifecompanions.org/uploads/1/3/1/6/131607103/tubonowofoxa-niwusotoj.pdf
    • http://everydaysuperhero.co.uk/uploads/1/3/0/7/130738855/6981623.pdf
    • http://leightondelmia.com/uploads/1/3/0/6/130621052/6259775.pdf
    • http://easymacsupport.com/uploads/1/2/9/0/129099120/129099120.html?solidworks
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://larusepami.files.wordpress.com/2020/06/85600039373.pdf
    • https://sosasifen.files.wordpress.com/2020/06/sivogusu.pdf
    • https://sajajud.files.wordpress.com/2020/06/zivoripidi.pdf
    • https://zitipon.files.wordpress.com/2020/06/baruliror.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006621.bin
fcfc457448aac7c69f8ec35ad93727defc25de136a0c03460fe060fa52f1646e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6621 5472 bytes
font_01_sfnt_off0000787e.bin
06ef5ef26f08b958a9b1e4a2a85a449b0b10460d45492af281cbbd6e53c6972c
pdf-font-stream PDF embedded font (sfnt) at offset 0x787E 10752 bytes