Malicious PDF — malware analysis report

Static analysis result for SHA-256 924e714169221573…

MALICIOUS

PDF

80.8 KB Created: 2021-03-30 16:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f638a6f1ea85ec712b31cc26b9fcbd25 SHA-1: 9690bb0b45aaeef1475f08717feabef35536f4c0 SHA-256: 924e7141692215732c1a7ce7fbfb5fbfa842d133e5a9a6dce3c008020c58af74
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jumiwimov.ru', which is likely used to host a phishing page or deliver a second-stage payload. The document body, though heavily obfuscated, contains keywords related to 'strategic capability definition', suggesting a pretext for the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/award?keyword=strategic+capability+definition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448113/normal_600a6b4f3aad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_601389670bfc4.pdfIn PDF document text
    • http://verification-help.com/66932104747mkdh5.pdfIn PDF document text
    • http://instofficial.online/141116444234t8yz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_602eb80582962.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/vadupigip.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/bhattacharjee_thermodynamics.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/acca_f2_revision_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447108/normal_5ffdd18df1348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/81373592724.pdfIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_09a9530af5fb4149949ed4319831b550.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/425cfbdb-9195-4bea-90ab-fdf7d9d9702f/gotusujanodebunetafuluva.pdfIn PDF document text
    • http://gajopule.myartsonline.com/11722153039.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/fijimurofalewifu.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/linux_administration_a_beginner_s_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86e5cb3-1c49-49b1-9346-5232b23fc27b/xorew.pdfIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_6e3ada3470f3442caa5ad81e5e64ae36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdffd72-f4a1-4ade-b707-8e4068f4a18a/nonfiction_reading_comprehension_strategies_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc147ab-9d20-4002-acc8-d801383fc0bd/wolf_stove_and_oven_30.pdfIn PDF document text
    • https://ce419959-236d-4487-89d7-67f356bda573.filesusr.com/ugd/147b51_914df44461f3409ebcbba50e5dba20d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujapu/drools_feeding_guide.pdfIn PDF document text
    • http://zezofakarol.myartsonline.com/xusisiguzoxo.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_76cc74d3c49a4d29bd6f03ae7d1e1aef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b6d20b-e7ad-409d-96cf-13c6dbd1df00/viduximege.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_090f807ec88a43ad9e95a7c9fb003b63.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 5280 bytes
SHA-256: cea343a6a94e6c0538865d9baf7a8747a061978b261b496159617a87d7c573a4
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 9984 bytes
SHA-256: 4270365a3f93b9d63048a2dfb564a68bdf43a5980f5bfc3ef0e85b78d3f825cb
font_02_sfnt_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c