Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e7bf5f001312da…

MALICIOUS

PDF

35.0 KB Created: 2020-04-11 10:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 13d6bc4c3305a960a8cd4c38541d6681 SHA-1: 1d0ea4222c5ec0b8551f909002663c2dea1ff7c4 SHA-256: b4e7bf5f001312da64d56efa1ca25a92fb4cf07d7cdfcfead98e6df84476dc19
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata, but the primary malicious function is the distribution of external links.

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://agirlfromodisha.com/uploads/1/3/0/7/130738846/130738846.html#il+2+sturmovik+battle+of+stalingrad+deluxe+worth+it
    • http://turnipseed.ca/uploads/1/3/0/5/130542907/nunim.pdf
    • http://southeastpaving.irish/uploads/1/3/0/8/130813740/1a49f6d003b3e52.pdf
    • http://greenplanetonline.org/uploads/1/3/1/4/131406714/60c4d.pdf
    • http://woodwardmagnet.com/uploads/1/3/0/7/130775127/mejazexotoda_bepudiw_finowikog_zoxazowumavo.pdf
    • http://earthmammablog.com/uploads/1/3/0/8/130814534/visasakotogulola.pdf
    • http://brasherfamilycareclinic.com/uploads/1/3/0/5/130546294/tilurolig_jelewixe_dipusob.pdf
    • http://limetry.com/uploads/1/3/0/9/130969723/xuvorasipifoj.pdf
    • http://titusgcinc.com/uploads/1/3/0/7/130739763/zuzebolivesoxi.pdf
    • http://reachenglishandnorwegian.com/uploads/1/3/0/5/130589145/afd4ecfaf5e7.pdf
    • http://me2umassage.com/uploads/1/3/0/7/130739491/72de12b23a.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_off00005e2b.bin
1ecca3035bf211187bac70ffd27a6cb4050a6e75db35a4e3791f905cc2da6d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2B 8868 bytes

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