Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b6c1f00f1fff33…

MALICIOUS

PDF

58.9 KB Created: 2020-11-10 21:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d55aaa1ae940a53381408fa5e9ec4420 SHA-1: 19572909d162aceba0f64c23b573f46bfa33afe8 SHA-256: 78b6c1f00f1fff336a3a0d9fe26efd785ef3a165a231839abb9df02d9202bae9
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/123?keyword=st+louis+catholic+church+waco
    • https://jozitosada.weebly.com/uploads/1/3/4/3/134325699/7561de82a.pdf
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/1052771.pdf
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/roseti-xurovugov-dubamikatere.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d9c97a2-c82f-48be-bdf6-a4aec548745e/apocrypha_books.pdf
    • https://uploads.strikinglycdn.com/files/06422f21-e392-4db2-8764-982b05494c74/40867921359.pdf
    • https://s3.amazonaws.com/fopalew/irobot_roomba_805_manual.pdf
    • https://uploads.strikinglycdn.com/files/4e41d6e3-4b28-437e-bf40-1fd5bd249ffa/76813442957.pdf
    • https://uploads.strikinglycdn.com/files/ca37243c-eb0b-4d12-84d5-8570a685593a/62914742091.pdf
    • https://s3.amazonaws.com/mejigavukolu/82481219431.pdf
    • https://uploads.strikinglycdn.com/files/a4e962a3-93b2-4392-bf8b-f21894f1a237/joxusenomaza.pdf
    • https://s3.amazonaws.com/zijivevip/hoke_county_schools_gmail.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_off0000abd1.bin
368f288bdb2596c7ebbe940f9341ed2040fb3e2323c53584559cea3236c60ad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABD1 5080 bytes
font_01_sfnt_off0000bd20.bin
55510ecd1136536b788703593a63c754be6c14515e089ef4ba1ab481c8c88ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD20 9992 bytes

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