Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4aa62531987cc4…

MALICIOUS

PDF

65.5 KB Created: 2020-04-27 01:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5a6b87b92d0f2cd5e11f0ae9781b460 SHA-1: ccb5157cef9b5aa4635499e024cfd7057694bbc7 SHA-256: 5f4aa62531987cc46160d036a6285baba19554ef03fa16dd1a6f187242440d6d
136 Risk Score

Malware Insights

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

The PDF contains a lure referencing "Fusee gelee exploit guide" and numerous links to external PDF files, suggesting an attempt to direct the user to malicious content. The ML classifier strongly indicates maliciousness, and the presence of multiple algorithmically generated URLs points towards a link farm or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sdsufiji.com/uploads/1/3/0/7/130740249/130740249.html#fusee+gelee+exploit+guide
    • http://id-da.com/uploads/1/3/0/5/130545816/7023461.pdf
    • http://bsbac.org/uploads/1/3/0/6/130639855/zisitodiboteb.pdf
    • http://curvaceouscoutureweddingdressnh.com/uploads/1/3/0/4/130488141/2101661.pdf
    • http://outsourceadministrative.com/uploads/1/3/1/6/131636881/kivisijufavovuf_gamajeg_suzakerakal_wujuvaxexi.pdf
    • http://nowandzenpet.com/uploads/1/3/0/6/130604428/8377330.pdf
    • http://motexplusglobalsolution.com/uploads/1/3/0/4/130483767/momumelegijag.pdf
    • https://ismyswitchpatched
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce96.bin
ed30d6e924a3b459a3c74bc4572abbd2464b4a727c891c7c1dd398edd07cef97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 9460 bytes
font_01_sfnt_off0000f1a4.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 1708 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.