Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab71ba011de016c…

MALICIOUS

PDF

72.0 KB Created: 2021-04-04 06:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 12ae4dbbe37ade2bb829bf3fc83c975f SHA-1: 7f709ccd17ee34f674569cc4768e3a1872efb331 SHA-256: 4ab71ba011de016cd92d91ebffc2a740f27aee06b9d2bae009f4142883cefc4e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain associated with a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a technical handbook.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=cnc+programming+handbook+third+edition+pdf PDF link annotation
    • http://health2health.online/wevopujovupiqlul.pdfIn PDF document text
    • https://momiweporav.weebly.com/uploads/1/3/4/7/134745900/jomewuzanufuvene.pdfIn PDF document text
    • http://oneitshop.info/67645243417rwua9.pdfIn PDF document text
    • https://xegezegev.weebly.com/uploads/1/3/2/6/132683484/kasevev.pdfIn PDF document text
    • https://rolurenogilu.weebly.com/uploads/1/3/4/0/134096536/9593882.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://uploads.strikinglycdn.com/files/9bafcb2b-edab-486d-92a3-01e84004fb11/vocabulary_workshop_level_d_answers_unit_4.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_95ea9f08c89a4c16817795a0483c4620.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/gazev.pdfIn PDF document text
    • http://gedawov.epizy.com/solve_logarithmic_equations.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/maus_1_chapter_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68414326-2966-447f-b39b-bb86cc1634f8/39841330107.pdfIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_e66ec5cc3c7c44358122887616a0c399.pdf?index=trueIn PDF document text
    • http://bolusober.epizy.com/fire_safety_risk_assessment_template_uk.pdfIn PDF document text
    • http://valolezame.epizy.com/entire_bee_movie_script.pdfIn PDF document text
    • http://dimogotewebi.epizy.com/serexakinagipinobukabofij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18dd615b-ea56-4914-abe2-c73e2dec07d8/lijetubidinususonotab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc78ce23-df1e-46c9-a605-17774fa81a28/java_swing_example_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595544ef-c4d6-4af7-9713-1a224323ee2f/darufizan.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/nebufepusoxi.pdfIn 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_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 5372 bytes
SHA-256: 71353483b8f6c32f91f94d7b0cae43624f0f38ccdd6bac9d32ff360e4e354ea3
font_01_sfnt_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 10000 bytes
SHA-256: c7fd4acd81269423d841ecef5ed5eb61851dea974d9aad35a195e4d353a1c93f
font_02_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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