Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e3c551ce0ca1a7…

MALICIOUS

PDF

73.2 KB Created: 2020-06-07 02:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f5db08b8015a2f0afb79a9441e4491c SHA-1: 56becbfd142bcf65e48ba6a82fa35dafa75675e7 SHA-256: 72e3c551ce0ca1a74a5f95b6af84b1529414f4a44bed0155be99325d9d0d1a77
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious websites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious intent to redirect users.

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://gjh40.slpny.com/uploads/1/3/0/2/130272260/130272260.html#operaciones+unitarias+en+ingenieria+quimica+6ta+edicion+pdf
    • http://jkconstructionremodelingllc.com/uploads/1/3/0/7/130738572/6692135.pdf
    • http://webmail.yourendoflifeguide.com/uploads/1/3/0/7/130739669/bovoxox.pdf
    • http://mta-sts.mx.massageandskintherapybykaren.com/uploads/1/3/1/4/131438110/16b8e50.pdf
    • http://thehapticmind.com/uploads/1/3/0/8/130813852/wumoxi-zejelazuluvugom.pdf
    • http://editwizards.com/uploads/1/3/0/6/130621393/9194140.pdf
    • http://amitahuja.com/uploads/1/3/0/6/130639369/3f0d11dd8869c3d.pdf
    • http://elitesecuritywv.com/uploads/1/3/0/4/130436202/4841268.pdf
    • http://tridentjobs.com/uploads/1/3/0/7/130739793/5316683.pdf
    • http://bentworthcommunitycenter.com/uploads/1/3/1/4/131407734/6444a5e3.pdf
    • http://wheelerldealer.com/uploads/1/3/0/2/130287428/a0301.pdf
    • http://bounce4joyrentals.com/uploads/1/3/1/3/131380021/ligadasudefa.pdf
    • http://flashtrailers.com/uploads/1/3/0/9/130969343/mapesu.pdf
    • http://gracelifecollege.org/uploads/1/3/0/5/130540146/sugijerodasogos.pdf
    • http://crystalclearkayakadventure.com/uploads/1/3/1/8/131856666/7491415.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gifamadez.files.wordpress.com/2020/06/wumebelawi.pdf
    • https://fodufeg.files.wordpress.com/2020/06/56265015391.pdf
    • https://sizelomitek.files.wordpress.com/2020/06/44979401228.pdf
    • https://rokoxopudese.files.wordpress.com/2020/06/masatep.pdf
    • https://fosapab.files.wordpress.com/2020/06/kofurobuvi.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9a.bin
0ac02da15eb285ea697aa42e40184493ea868c9abe23b8ffb04d71f014713099
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 13212 bytes