Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4417a9486685d5…

MALICIOUS

PDF

83.4 KB Created: 2021-03-22 10:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7bb86461626878c03aab6cd0d14edf5e SHA-1: 771f6c02171a09951e3a3e8ba8ba886fbdc3fe48 SHA-256: fd4417a9486685d5b4a07c32d9a520459d157dc285633ef3874049974b89f8f0
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on a URL that appears to be a lure for a phishing or malicious site. The ML classifier strongly indicates maliciousness, and the presence of embedded links suggests an attempt to redirect the user to a compromised or malicious domain. No scripts were extracted, but the PDF structure itself is indicative of a link farm or SEO poisoning technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=stephen+covey+principle+centered+leadership PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6033b7863d84e.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/wamisijidirobaziseto.pdfIn PDF document text
    • https://revarepafe.weebly.com/uploads/1/3/3/9/133997647/9459671.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/e35aa540ba3326e.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/vapomu.pdfIn PDF document text
    • https://lemevepavakupe.weebly.com/uploads/1/3/4/7/134701524/9928042.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/86500515656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466408/normal_5feed6308810b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_602b48ed12a2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_976bee174e8b4983aafe49a9d19902d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/does_apple_books_have_audiobooks.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/rinudinuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/40707058763.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/kuvabog.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_3f500987814c4fe6820dd5428fc45a50.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_b0af59d33ef2481bbf8fc42b1a578359.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/transformers_bumblebee_hasbro.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_5e230308c49c46269d712224358eb773.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_deb8214d9aaf4a999c5261e6d2489a68.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 5428 bytes
SHA-256: 0b716c2f3e680272db65a50bed517c3d5448cccfe01b5b1bdc79dae19cb6a4d7
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 11272 bytes
SHA-256: e766a4d1c9d00bae89daf5642582674cb3fec38cb553a4ff4f2f9b22cc9be089

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