Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac03aa98fbb5961b…

MALICIOUS

PDF

81.8 KB Created: 2021-05-09 00:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4ca774fc142f7c35a03fa4b1722cb7e8 SHA-1: 23cb2361bf35c643101caf17141226dd3c2af6e8 SHA-256: ac03aa98fbb5961bf98173f6764c3a1ae56146240972f90a19db1e98727da1db
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to the price of installing natural gas. The presence of multiple disposable hosting links further supports a phishing or scam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing attack, likely using embedded JavaScript for redirection or further exploitation.

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://kuzutuzo.ru/strik?utm_term=precio+instalar+gas+natural+en+un+piso PDF link annotation
    • http://wuzulosijeg.22web.org/midojomivi.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/belitaxexuvidejuxozu.pdfIn PDF document text
    • http://zuvixomajav.22web.org/deloitte_annual_report_insights_2016.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/33239861643.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/preeclampsia_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_8e4647bec559478793c0ff3e671c8790.pdf?index=trueIn PDF document text
    • http://momerizimapunu.epizy.com/392031794.pdfIn PDF document text
    • http://nizexududitew.epizy.com/46846623154.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/doll_house_people.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/23599730574.pdfIn PDF document text
    • http://zakexukosogu.atwebpages.com/boaters_exam_study_guide.pdfIn PDF document text
    • http://xolazituvote.epizy.com/fire_report_colorado.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_fda34c75c38e450ab3dff81504204770.pdf?index=trueIn PDF document text
    • http://wumafopid.onlinewebshop.net/public_policy_in_australia_theory_and_practice.pdfIn PDF document text
    • http://pinopog.rf.gd/3412961326.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_5d9a04a4647d4a759cea6707a592e71e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/how_do_you_dry_clothes_in_ariston_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/vafasogapalufiliso.pdfIn PDF document text
    • http://fowafad.epizy.com/ygdrasil_jorge_baradit.pdfIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_75bd924b19cc496f8c5c6021b9aa7998.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 5100 bytes
SHA-256: 83ba167c3ed1cf7af0a431a56f5bf8805293612729cffb3dcf456ec4527c7664
font_01_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 12296 bytes
SHA-256: 675e13434fc9a9008954577a6eb12fd6e6930fd6f54514f26d7233834bcdf22c

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