Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f57d10820400940…

MALICIOUS

PDF

38.5 KB Created: 2020-03-07 14:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9d6314350343d85c14b1005219cdaa7a SHA-1: 5c2f9f40ee6d1531ded78dcf9242d81c9aa50e24 SHA-256: 0f57d10820400940de145464038ee47104f07d0addd9fb931d7a09edf88337e3
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a content-luring or SEO-based malicious campaign.

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://webmail.themodestshoptx.com/uploads/1/3/0/8/130813054/130813054.html#kutcher+adolescent+depression+scale
    • http://drgnzombiestournament.com/uploads/1/3/0/5/130551536/xavenif.pdf
    • http://necesitoarte.com/uploads/1/3/0/4/130489475/732750.pdf
    • http://ntwstudioart.com/uploads/1/3/0/7/130775643/noxaputiguwusuxibaja.pdf
    • http://coachparent.com/uploads/1/3/0/4/130435654/9791811.pdf
    • http://mail.hh4j.org/uploads/1/3/0/7/130740562/kujuve_vuserewidapi_dupozoteg.pdf
    • http://motoadventure.club/uploads/1/3/0/6/130621035/tuzilul-badux.pdf
    • http://ecoursebydesign.com/uploads/1/3/0/6/130622111/4298612.pdf
    • http://whydyetyedye.com/uploads/1/3/0/8/130874648/nibad-tumisavolo-tafotamabawab.pdf
    • http://www.ciauaka.com/uploads/1/3/0/5/130543462/wanoguriw.pdf
    • http://totaleclipsewindowtinting.com/uploads/1/3/0/6/130603906/wujiga-xokerutipur.pdf
    • http://www.beachlookingguy.com/uploads/1/3/0/6/130621359/0642dbd4.pdf
    • http://mta-sts.mail.olympicmountainearthwisdomcircle.org/uploads/1/3/0/5/130589386/sotewanomiki.pdf
    • http://74-123-79-178.mgwnet.com/uploads/1/3/0/9/130969854/vopunuditopenab-zavazuzatikek-libizipelosa-mixedeloguv.pdf
    • http://chasm-book.com/uploads/1/3/0/6/130604145/3549812.pdf
    • http://uniquetouchofsparkle.com/uploads/1/3/0/3/130324440/e716dc0aee48.pdf
    • http://mydmdesign.com/uploads/1/3/0/5/130544063/suverimekusaxovi.pdf
    • http://crossconnextion.com/uploads/1/3/0/8/130874339/ed51e09453f26.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_off00006d8b.bin
13c68c59d9f4262d4969fea92d72672e114b7696abc2e3363346c9fe090d2f27
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8B 8144 bytes