Malicious PDF — malware analysis report

Static analysis result for SHA-256 331551cebcd98b06…

MALICIOUS

PDF

81.2 KB Created: 2021-05-09 16:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f021a33c2cf7b0bc33e2620cf482f12f SHA-1: 21e0dcd8b4478d1aaa5b51d181d34187a1bb0fcf SHA-256: 331551cebcd98b06d7c5b44bdc02dff870456aecee80609a1c9c42628e5affae
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The PDF's structure and content suggest it is designed to deceive users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=diagrama+de+clases+y+diagrama+de+objetos PDF link annotation
    • http://otomail.business/how_to_be_a_real_estate_agent_in_victoria833l6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405419/normal_5fca272c4619d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_60608abc47d4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475570/normal_5ff8aa0f63301.pdfIn PDF document text
    • http://vekvelo.ru/mumoxoreliki83s.pdfIn PDF document text
    • http://pijevovonojatev.iblogger.org/39309096601.pdfIn PDF document text
    • http://xasunibi.iblogger.org/yamaha_mt_15_bike_image.pdfIn PDF document text
    • http://logoped-samara.ru/98318125719rnerj.pdfIn PDF document text
    • http://gidilixad.66ghz.com/vufizefudobowetimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_606c0be7a689d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_606384094b762.pdfIn PDF document text
    • http://jiresumojunivup.22web.org/mufiriredomizonopimuzap.pdfIn PDF document text
    • http://neo-tp.ru/how_to_figure_voltage_in_a_parallel_circuityosxt.pdfIn PDF document text
    • http://terem.space/ravevalimukovutumizofipeu60bk.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/dutimajizowa/fixed_short_term_employment_contract_template.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_5dfffc9c322f49eb83736d64806cc7ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mulerux/city_of_pittsburgh_building_code_violations.pdfIn PDF document text
    • http://tebubejusudigu.rf.gd/bengal_famine.pdfIn PDF document text
    • http://xipokawopigigig.epizy.com/chads2_score.pdfIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_75ccc1a48fde4a6d928e1de31ca1d28f.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_a3a947f31cdc4b12b6eaccd8a9842e8d.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_0039c86936fa4c5a9862042edf53fd79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/freelance_contract_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/cuanto_son_100_gramos_de_azucar_en_onzas.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_3b706872831f4a4cb73aecd8e337d594.pdf?index=trueIn PDF document text
    • http://tojugejuxutusur.epizy.com/valvoline_synpower_mst_5w30.pdfIn PDF document text
    • http://dasopikabuma.rf.gd/wositolejavilop.pdfIn PDF document text
    • http://wafogaz.rf.gd/vabibebidomozidakon.pdfIn PDF document text
    • http://xozutafutigifa.rf.gd/pexusekefagenulefe.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/classification_of_anemia_ppt.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 5576 bytes
SHA-256: 9a14a3fbb76b48b61c973657e60cbe11fe3e762a77c3c3865136a07aecdd57da
font_01_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 11772 bytes
SHA-256: 29b1976d0853e1f017fed2cafabfc4cdc15a73bf9a9074b0956af785e285d2a5

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