Malicious PDF — malware analysis report

Static analysis result for SHA-256 5821b07c44c0d06b…

MALICIOUS

PDF

50.6 KB Created: 2020-11-08 16:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b3887f8897c5dee88c1722f1406f0dc SHA-1: 1933684cefde46b2d559e0ee17d1776e47aa56dc SHA-256: 5821b07c44c0d06b203b036e507982257d3261bfcbe2798256845f75cc3bcd73
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a prominent one pointing to 'trafffe.ru' disguised as a 'Zillow rentals management' search result. This suggests a phishing or scam attempt to redirect users to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 https://trafffe.ru/123?keyword=zillow+rentals+management
    • https://gidujinogojavu.weebly.com/uploads/1/3/4/0/134096303/6249227.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f8f1ccae5e8e.pdf
    • https://cdn-cms.f-static.net/uploads/4454300/normal_5fa4f63ecb67b.pdf
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f92e1141b090.pdf
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f895016d4805.pdf
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5fa53c6105de2.pdf
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f95e52e5faa3.pdf
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f8f782e5cff8.pdf
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5f92312c51c15.pdf
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/1531605.pdf
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f8f355bae0d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/500d5ee0-17ce-4e05-96f8-5bd4183b35af/vufizomadepe.pdf
    • https://sigonofov.files.wordpress.com/2020/11/89828069798.pdf
    • https://uploads.strikinglycdn.com/files/f9adc5d2-0d28-45f7-b4ec-e9092f73e440/riluwur.pdf
    • https://uploads.strikinglycdn.com/files/25efc84f-afcc-403b-a4c7-a0281dca2e57/nifiroxejiwibiliwereguwa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ad8.bin
84b6b9daae9128e17ec09fd5eb7f1382ee920d622e07f0b4703b63ca49195e76
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD8 4840 bytes
font_01_sfnt_off00008b36.bin
ed19162da5266a297b83e44b19b271b5fc0955ccd63d4b2954fc171031322a41
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B36 10588 bytes
font_02_sfnt_off0000af6f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6F 4324 bytes