Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abf0273b3e88209…

MALICIOUS

PDF

32.5 KB Created: 2020-05-24 05:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6182a775d82d51f24fa0b466551e6f55 SHA-1: 25cdbee9a88ec6d299ba4d3fae61d22e894b59f1 SHA-256: 7abf0273b3e88209d6aeaa8759d5544bbf277dd3ec760a7774f447cb0e68225e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous embedded URLs, suggesting a link farm designed to redirect users to malicious sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update, a common social engineering tactic. While no scripts were directly extracted, the presence of embedded URLs and the lure heuristic strongly suggest the document is intended to facilitate the download and execution of a secondary payload, potentially via JavaScript exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://4tbdn.salon225.com/uploads/1/3/1/4/131406387/131406387.html#commonlit.+org+answer+key
    • http://ceremoniousgifts.com/uploads/1/3/0/4/130488098/7381070.pdf
    • http://violinpractiseforkids.com/uploads/1/3/0/6/130604456/562b01.pdf
    • http://byeweekballers.com/uploads/1/3/0/9/130969391/vurabix-pedukuti-relelukatof-linaxipada.pdf
    • http://orlando-windshield.com/uploads/1/3/0/4/130476565/78f9cccb9a.pdf
    • http://gynecobstars.com/uploads/1/3/0/4/130477613/jiwafibuzometig.pdf
    • http://who-are-they.net/uploads/1/3/0/2/130272389/xosukipotisaxa.pdf
    • http://mywaistbh.com/uploads/1/3/0/7/130739583/1e387b320f18ae7.pdf
    • http://underlinepoetry.com/uploads/1/3/0/3/130323892/3369218.pdf
    • http://welcometo6h.com/uploads/1/3/0/8/130874583/fuketerak_fevufexoxenukel_rodidezujixevo.pdf
    • http://wadokaisouthwest.com/uploads/1/3/0/2/130287495/ronuxuxa.pdf
    • http://matamuasu.org/uploads/1/3/0/6/130639978/tetuximeba-timokavug-ziwurimizanejiw.pdf
    • http://topflightsoccertours.com/uploads/1/3/0/8/130815031/xufamakerufukevevabo.pdf
    • http://apasapeldalutare.com/uploads/1/3/1/6/131636947/f3353f943c2.pdf
    • http://webmail.drdiet.com/uploads/1/3/0/4/130476102/sugaxijom-vufuvupaseti-kidet-tuzikofozebi.pdf
    • http://thebestofbigsky.com/uploads/1/3/0/6/130622011/bfa87.pdf
    • http://techknowledgeuae.com/uploads/1/3/1/1/131163853/9901610.pdf
    • http://hostmaster.jeannetax.nl/uploads/1/3/0/4/130435843/5658375.pdf
    • http://elkriverhvac.com/uploads/1/3/0/5/130551258/294119.pdf
    • http://prettypracticalnc.com/uploads/1/3/1/4/131437873/a8e83fc81b8ff0.pdf
    • http://manosunidasac.com/uploads/1/3/0/3/130323216/fojimow-dunapizaponis.pdf
    • http://fieldspaniel.net/uploads/1/3/0/8/130814085/dodina_suwefekizarijem_mefoririroguda.pdf
    • http://unleashthemusician.com/uploads/1/3/0/5/130543402/d35c5b1b363f.pdf
    • http://lldenc.com/uploads/1/3/1/3/131381540/labaxuwatixap.pdf
    • http://zereldasinclair.com/uploads/1/3/1/4/131438517/wupilizifakimurud.pdf
    • http://squirreldogwalking.com/uploads/1/3/0/7/130739983/kuzodijovoli_rolarenof_samazoku_rumigogamovev.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_off000056c3.bin
1af4575d7ea0c9b26a38fc14c37b0d9608829a718e58f2f9609dee1c6d472292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C3 9176 bytes

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