Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a40c246e513ca3…

MALICIOUS

PDF

47.6 KB Created: 2020-05-19 11:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda1e9e67bae8fbe89d0dd0bb52d3f86 SHA-1: e5a021937ff65a242f85846e54df77fc4443cfe9 SHA-256: 60a40c246e513ca315003a7a0027b05937eb7d9ae0cc15bed7de8119a495de37
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure exhibits characteristics of a link farm. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://radmanusa.com/uploads/1/3/0/2/130289448/130289448.html#ejemplos+de+metodo+historico
    • http://traversebaypainting.com/uploads/1/3/0/7/130776814/5879375.pdf
    • http://risingorg.com/uploads/1/3/1/8/131856109/tulilep.pdf
    • http://sfw2018.com/uploads/1/3/0/5/130540077/11f07.pdf
    • http://sarahlaurencollins.com/uploads/1/3/0/7/130776125/dc2d44.pdf
    • http://nsecbionutrition.com/uploads/1/3/0/5/130550732/b87b611c35cba.pdf
    • http://jessicasipe.com/uploads/1/3/1/4/131407051/mukopebe.pdf
    • http://elevatorminutes.com/uploads/1/3/1/1/131164558/dejemifejadoniro.pdf
    • http://loveandliveabundantly.com/uploads/1/3/1/4/131453494/pagogatoxiredofejil.pdf
    • http://chriscalifornian.com/uploads/1/3/0/7/130738715/279090.pdf
    • http://saxtonsiteservices.com/uploads/1/3/0/6/130604951/metoxe-devesukob-jomisuk-liwemebap.pdf
    • http://girlstosuccess.com/uploads/1/3/1/0/131070979/tojosevegufoxuk_joletixo.pdf
    • http://impactmesh.net/uploads/1/3/0/9/130969910/3873744.pdf
    • http://creditabsb.com/uploads/1/3/0/8/130813841/konakesijibapijunos.pdf
    • http://tribalallday.com/uploads/1/3/0/7/130740524/jutegaz.pdf
    • http://greenhavenstable.ca/uploads/1/3/0/4/130475966/fanev-xufaje.pdf
    • http://usabuildingmaterials.com/uploads/1/3/0/6/130639949/labuzadawewatum.pdf
    • http://authoretheldiggs.com/uploads/1/3/0/6/130640111/ddd627c6130.pdf
    • http://pope-culminating.com/uploads/1/3/1/6/131636745/afb02a30f5746c.pdf
    • http://selahtimes.com/uploads/1/3/0/5/130590191/nebovotobipojega.pdf
    • http://southeasternclubcl.com/uploads/1/3/0/6/130603772/3108620.pdf
    • http://safedrycincinnati.com/uploads/1/3/0/7/130775384/minesufeziwi.pdf
    • http://friendsofthejohnsonnaturecenter.org/uploads/1/3/0/9/130969555/7581428.pdf
    • http://ftxitaly.com/uploads/1/3/0/5/130590410/budaludoke.pdf
    • http://uaeara.com/uploads/1/3/0/3/130313643/68fca8bbba49d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a36.bin
424b233ce7228893454279d1b10a592ae8da3a17d0cbfa6fce6a2695c273b4d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A36 11872 bytes

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