Malicious PDF — malware analysis report

Static analysis result for SHA-256 b357996953ae1de7…

MALICIOUS

PDF

33.4 KB Created: 2020-11-07 11:33:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39bab65200caad11d45dffafb3aab381 SHA-1: 1222adb135a44b742e6fb7882016bcbcce869b62 SHA-256: b357996953ae1de7b7876e1893008a839c89f4ce6d3dd272ae876292056bf201
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent URL suggesting a lure for users to click on potentially malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to external sites. No scripts were extracted, but the overall structure and URL distribution suggest a link-farming or phishing attempt.

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://trafficel.ru/123?keyword=electron+dot+diagram+worksheet+%25231
    • https://cdn-cms.f-static.net/uploads/4408593/normal_5f9528a592f06.pdf
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/popevijin-kosuwareduvudiz-gitujemerof-setodavul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5f67aad8-f5c6-4490-a290-060716ceaea5/18838979093.pdf
    • https://uploads.strikinglycdn.com/files/5d5be420-5f5f-4aa7-8ffe-b5cc9d4fdc52/bogles_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/afaaa48d-4025-4d05-96b5-ea05adb9b4ab/regardez_lhumilit_de_dieu_partitio.pdf
    • https://s3.amazonaws.com/banula/9th_grade_spelling_bee_words_list.pdf
    • https://uploads.strikinglycdn.com/files/63b53525-0a89-442a-8059-411b6950e157/dukejilise.pdf
    • https://uploads.strikinglycdn.com/files/cff78dd4-66f9-4bb3-a658-2af4fe09dfba/kanonunetej.pdf
    • https://uploads.strikinglycdn.com/files/b9b70157-5254-439d-921e-d3258e8d5ebc/84237207159.pdf
    • https://uploads.strikinglycdn.com/files/a2883dec-6d09-4e0d-9ef5-1456bd7c0c5b/22216657139.pdf
    • https://uploads.strikinglycdn.com/files/342aef6a-2d58-4953-befb-83c10675cdbd/25770907117.pdf
    • https://s3.amazonaws.com/kigavanus/b._ed_syllabus_odisha.pdf
    • https://uploads.strikinglycdn.com/files/c957fa4c-0bb2-44c2-93cc-4fc6333fd96f/9649525380.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_off0000450b.bin
7c34c23a98feb4f6c5e5f1a0039bbaea1e5a6e8f4e82d3ff9903dcd19b1e4bfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x450B 5464 bytes
font_01_sfnt_off0000578c.bin
57f5dfdd307e755cd23c8a29274155297289f77d6015282e174c9fdd2bf24f04
pdf-font-stream PDF embedded font (sfnt) at offset 0x578C 10328 bytes