Malicious PDF — malware analysis report

Static analysis result for SHA-256 b975a58b712903c1…

MALICIOUS

PDF

35.9 KB Created: 2020-06-10 11:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b325d320c4a54f021d8e2f05411f62 SHA-1: 2f43b6de70d5175b3af77cc90f44f68590dceca1 SHA-256: b975a58b712903c18af33711695e454a69fb9c3fe4ba9c95ac7e203d690f8a24
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of external links, characteristic of a link farm. The document body, though partially corrupted, contains URLs that are also present in the heuristic findings. The primary attack pattern appears to be directing users to a multitude of external PDF resources, potentially for SEO poisoning or to serve as a distribution point for further malicious content.

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://jewelrysoycandles.com/uploads/1/3/0/7/130739584/130739584.html#biblia+internacional+en+espa%25C3%25B1ol
    • http://thornfoundation.com/uploads/1/3/0/6/130640079/754601.pdf
    • http://oxfordimmunealgorithmics.com/uploads/1/3/0/5/130589077/1e446cbb4.pdf
    • http://wrywit.us/uploads/1/3/0/7/130739892/9649369.pdf
    • https://depezexigit.files.wordpress.com/2020/06/3609354240.pdf
    • https://lakumilovu.files.wordpress.com/2020/06/5477622303.pdf
    • https://ruvasitib.files.wordpress.com/2020/06/47194005056.pdf
    • https://sixuxonudibi.files.wordpress.com/2020/06/39745972380.pdf
    • https://potavetuzeva.files.wordpress.com/2020/06/pozakavinabadifeg.pdf
    • https://kijukadolok.files.wordpress.com/2020/06/sinujixowumotadafuk.pdf
    • https://juzifak.files.wordpress.com/2020/06/72447275965.pdf
    • https://wunugevakel.files.wordpress.com/2020/06/37341579894.pdf
    • https://tuvuxexe.files.wordpress.com/2020/06/pipeloga.pdf
    • https://vuvobifo.files.wordpress.com/2020/06/59226440107.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_off00005c55.bin
6e0e92bd0a830d9036f47a56162c612d10a8f7d0a02c2f638f56a2c39cc01f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C55 11984 bytes

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