Malicious PDF — malware analysis report

Static analysis result for SHA-256 04856293d4904e1b…

MALICIOUS

PDF

47.5 KB Created: 2020-04-15 12:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cd42b3cf10033bb343177982f61de5bf SHA-1: 07516f08abbef549269239a5d438a05168aef1f3 SHA-256: 04856293d4904e1b08967b5918040e6bca80b8e1df0d9c3e48e31344e5d05962
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, reinforcing the idea of a malicious redirection scheme. While no scripts were extracted, the presence of many external links and the ML classifier's high confidence score point towards a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://yourflexpack.com/uploads/1/3/0/7/130775447/130775447.html#banjara+dj+hd+video+songs
    • http://patriotreport.us/uploads/1/3/0/7/130776489/257129.pdf
    • http://haberdashersguild.com/uploads/1/3/0/7/130738914/448b8381.pdf
    • http://brattybat.com/uploads/1/3/1/3/131398563/ddb1ce57.pdf
    • http://burdentransportation.net/uploads/1/3/1/0/131070073/zumuxevitup_luzibetuneme_liponexava.pdf
    • http://thomassakal.com/uploads/1/3/0/2/130272478/fajulegu.pdf
    • http://hanzihero.com/uploads/1/3/0/8/130813849/5947495.pdf
    • http://chackalayil.com/uploads/1/3/0/6/130604508/5289226.pdf
    • http://ctheworldacademy.com/uploads/1/3/0/4/130483956/nujubuzasixagises.pdf
    • http://lindawoodenddunstan.com/uploads/1/3/0/7/130775629/c5d4e07.pdf
    • http://galwaygallery.biz/uploads/1/3/0/2/130291786/916ba68ad0bba4e.pdf
    • http://zionsview.us/uploads/1/3/0/6/130620877/samipot_jumerene_jomuvunimurag.pdf
    • http://robertwakeland.com/uploads/1/3/0/7/130775529/jifomovigege-vodixazogiroja.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://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b38.bin
332df08af85ecf0738b9bae9de5bca3a01a1f42e511dd9fb0456eaca32d09e40
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B38 8036 bytes
font_01_sfnt_off00008a4f.bin
34032c2600ad0f2cc909f244ceca6c781acbc3f30cab12061e3efbdd81aeb927
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4F 5480 bytes
font_02_sfnt_off00009bf2.bin
fec7f76812290e64beb15f8ae038a0dbc3d10a5f52e6530d7bd82da3781390c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF2 7880 bytes