Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bedf990e5872521…

MALICIOUS

PDF

43.4 KB Created: 2020-03-16 08:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d55b7e6654e541c2d998216065a9e565 SHA-1: 4164b849d203bf4cad0025ae8106f4e1c767b144 SHA-256: 6bedf990e587252145c19c8fe9ef60271d796e4e364ac6d803de3e7ea3f0ac22
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The document body mentions 'Full screen wallpapers for mobile', indicating a lure to entice users to click on the embedded URLs. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment.

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://o2ki0.bpmtc.com/uploads/1/3/0/6/130621583/130621583.html#full+screen+wallpapers+for+mobile
    • http://greenxserene.com/uploads/1/3/0/7/130775027/1749036.pdf
    • http://www.loo-smart.com/uploads/1/3/0/7/130775760/09a499e2.pdf
    • http://allhelmets.com/uploads/1/3/0/4/130435619/bawoduzutev_fenejekokulok.pdf
    • http://webdisk.angiek9trainer.com/uploads/1/3/0/8/130874668/2402530.pdf
    • http://mysss.ca/uploads/1/3/0/2/130272930/nolelaxukojo.pdf
    • http://www.cook15landsmusic.com/uploads/1/3/0/7/130738785/d270b99a.pdf
    • http://plussizebridaldressesnh.com/uploads/1/3/0/3/130313253/9239559.pdf
    • http://inboundtrain.net/uploads/1/3/0/2/130287914/1895812.pdf
    • http://bridgetaxservices.net/uploads/1/3/0/4/130475932/sekubinopo.pdf
    • http://michelevevang.com/uploads/1/3/0/4/130475938/b18c53f7.pdf
    • http://guiascomerciais.com/uploads/1/3/0/5/130588789/f27317ac76.pdf
    • http://discgolfcamps.com/uploads/1/3/0/7/130776594/023e786bb0.pdf
    • http://siggesel.se/uploads/1/3/0/9/130969177/fabulup.pdf
    • http://www.ywamshipsgulfcoast.org/uploads/1/3/0/2/130270994/b241baea377ff9.pdf
    • http://greaterworkscic.org/uploads/1/3/0/5/130551536/4413369.pdf
    • http://annitidechild.com/uploads/1/3/1/0/131069890/nikajinazo.pdf
    • http://savethecourthouseclock.com/uploads/1/3/0/2/130287537/fed62.pdf
    • http://www.murderorientexpress.net/uploads/1/3/0/6/130604907/goxex.pdf
    • http://mllgndsgn.com/uploads/1/3/0/7/130776346/wofikajoso.pdf
    • http://www.kitab4all.com/uploads/1/3/0/3/130324119/puleramuba_guziwukasenimod_notisel_xoxisi.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_off00007d86.bin
79f3e64bf0ca8140cdd63c5eadc09602f70226d6830a07ba5801905d202a8e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D86 8460 bytes

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