Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4025ef0f1d4d13…

MALICIOUS

PDF

68.8 KB Created: 2021-01-12 06:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 190986b25c237b89e385ed18a6d47848 SHA-1: 1f896c0510d4f4d395c3eda40a720bd1278485a9 SHA-256: fb4025ef0f1d4d138f5e583b61e729baf3454c2012e65372f6d82362b7d8fb2a
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external links suggests an attempt to lure the user to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=the+common+man+apush
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/xumara_zapefajulomim.pdf
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/liselin-benekepo-fokupibo.pdf
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/3876579.pdf
    • https://site-1173450.mozfiles.com/files/1173450/72088565187.pdf
    • https://site-1177018.mozfiles.com/files/1177018/tebisajojesaduzokifuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sudevejerifu/puxokorabuvulibedakuj.pdf
    • https://s3.amazonaws.com/mejobu/93674426742.pdf
    • https://s3.amazonaws.com/miledu/76218898411.pdf
    • https://s3.amazonaws.com/jaloto/75659782081.pdf
    • https://s3.amazonaws.com/xulepiwa/nuxukosuvinikewex.pdf
    • https://s3.amazonaws.com/somamere/autocad_objective_questions_and_answers.pdf
    • https://s3.amazonaws.com/xabalaru/broiler_farming_manual.pdf
    • https://s3.amazonaws.com/tiniruru/dumuj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e0.bin
62143d558cdf782979a3f1952a7c221361124bcd6138599dfd82f334fb86bb38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E0 4996 bytes
font_01_sfnt_off0000e3b6.bin
f4f1f22ced55db9a85b8f3382042cd5414d573fbe404bfb93811fd6359b2bf3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 10260 bytes

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