Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae06b0fb7c54495a…

MALICIOUS

PDF

94.5 KB Created: 2021-03-26 09:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d463edd6eff6d5d8ccc008e59fab78d SHA-1: 79e9508ec6637fe88d7341716d4d2954461d6b19 SHA-256: ae06b0fb7c54495a71520f2c81f61ec3d86c5a20d2651ad5823fe8abaa4d4396
196 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a browser extension/update installation lure, indicating a social-engineering attempt to trick the user. It also contains numerous external links, suggesting it is part of a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://zajinet.ru/wix?keyword=file+explorer+root+browser+apk+download
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/98b7d97f6aaf.pdf
    • https://cdn-cms.f-static.net/uploads/4421940/normal_6054ddffd8d38.pdf
    • http://limecash.xyz/titoxitinifoddym3k.pdf
    • http://about-central.com/beethoven_piano_sonata_17_tempest_the_3rd_movementoai6l.pdf
    • http://zumepaposakuf.scienceontheweb.net/what_are_the_art_courses_in_nigeria.pdf
    • http://reduslim-officialsite.site/71999678703s17za.pdf
    • https://cdn-cms.f-static.net/uploads/4486566/normal_603c177e13f57.pdf
    • https://sunozidugeb.weebly.com/uploads/1/3/4/4/134486191/b08f16.pdf
    • https://cdn.sqhk.co/fabokofe/8XAjjAn/baborowonulutenaxa.pdf
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/latuvone.pdf
    • https://cdn.sqhk.co/vopirewilofo/2Zgghjp/48262586602.pdf
    • http://benilobodereji.mygamesonline.org/nizokep.pdf
    • http://lojapidabud.mypressonline.com/mpmb_spell_sheet_generator.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_564b11afbd4d40699887269a99bb43f7.pdf?index=true
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_bf0eb46bc9564262bd6bf9e7c84e338b.pdf?index=true
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_2951def3aaca49aebd09d79051cb9edd.pdf?index=true
    • 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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000104b6.bin
1a36d3c48d29dc65bd848413d5892a4301a6a96623db23e6e85af4aa85ce0fe2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x104B6 14476 bytes
font_00_sfnt_off0000f2b7.bin
d16582183ec8aec17f4e7fe48b7b7873919580ab0dd1cfba3bb39d8c4a2f811a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 5272 bytes
font_02_sfnt_off00012de8.bin
2bc33d70ecc420c6308e87e016dc4b96bddb2ba6b4392ec407ba910f30d5e8aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 11560 bytes
font_03_sfnt_off00015579.bin
8526cea79e0695337727b4a879bd90ba242f872c499e443c9c36ae1f03380b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15579 16448 bytes

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