Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f1aed47d7f8784…

MALICIOUS

PDF

106.4 KB Created: 2021-04-16 19:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 37f29aebdc32dcd284a116fc4e4b547f SHA-1: e932f47581148bd21b840137f083e14dac5d155d SHA-256: 61f1aed47d7f87844266e90a361a06ffb1f958a8848843a5a2772d3727c9096b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as search results for free book downloads, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further malware. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 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://lozipotod.ru/strik?utm_term=sherlock+holmes+sinhala+story+books+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464534/normal_602906a04f047.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/7626bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_6053b68f46286.pdfIn PDF document text
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/917d94.pdfIn PDF document text
    • https://masizomomom.weebly.com/uploads/1/3/2/6/132681315/36afc768b5.pdfIn PDF document text
    • http://pudumumununi.22web.org/english_language_gcse_revision_guide.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/nilogujin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6011f5532de15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefovu/59251638716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac25b06-7020-498a-9718-43c0b4ed7878/menaxepawobanodijudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5452ef8-f6e8-4132-83c9-2911138a927b/linear_nonlinear_functions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/free_fonts_for_android_apk.pdfIn PDF document text
    • http://levegukesiwus.rf.gd/principles_of_agronomy_reddy_and_reddy_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b91eb9-df11-4ad1-864e-13d51d52bb04/what_jobs_for_art_history_major.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/vatuzaxezelogawowivi.pdfIn PDF document text
    • http://fefirujo.rf.gd/mugisejeliwiraf.pdfIn PDF document text
    • http://talopufakena.epizy.com/38238369670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a691e631-62dd-492d-bbcf-3f07b084cee4/54900515233.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/62000134508.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/app_games_hacker.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/40396073780.pdfIn PDF document text
    • http://xoxudexutuku.rf.gd/fedugabofi.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/69287945631.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/wikopagasebedewobuzizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d88719-fa46-4cde-bd73-d9abdc59b4f9/lusosasapawotiwefozi.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/interview_questions_for_retail_store_manager.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
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 5896 bytes
SHA-256: 599d807b58b7ab64574ea7d97b8232b6681d3173c610ad5df855b360b8fdfcc3
font_01_sfnt_off000137b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B3 25728 bytes
SHA-256: 9e818a16681505d68c2cd09240db2b5bbcfd46a42231704b1b2ecc67977d017f
font_02_sfnt_off000174ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AE 10532 bytes
SHA-256: 3a60c21d0e3671411f8cc3a698ed40b96e0bd9b17fb9e76c6b7638f49c6636ea