Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e4866b4550d316…

MALICIOUS

PDF

87.0 KB Created: 2021-05-25 11:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90a99328c49d2cee8f96abdc72dcfd26 SHA-1: dbb790947fefea40e3f3c33fd858f77de0e957a0 SHA-256: 92e4866b4550d316e3fc1947450a32067e6ed815b164fd7ab43a1c567d5a98f8
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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://lozipotod.ru/strik?utm_term=vcruntime140.dll+windows+10+64+bit+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416496/normal_6058b46e05a92.pdfIn PDF document text
    • https://dodojojika.weebly.com/uploads/1/3/4/5/134503072/9655080.pdfIn PDF document text
    • https://sunutefe.weebly.com/uploads/1/3/5/3/135350425/fifili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445338/normal_6069c265cf078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_6037816268077.pdfIn PDF document text
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/212561.pdfIn PDF document text
    • https://pigudoxuwupif.weebly.com/uploads/1/3/1/4/131437670/pumutogener.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_6041d35d077dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5fd0f47a67be5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb91d960-eec3-45a9-bfe9-2893f8c6a145/55996991652.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/mamavogisiluzujolep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22fddf12-ce4a-4087-9f14-5fb1b72afd24/how_much_does_pewdiepie_make_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd2976b-50bd-48b0-ae55-c480a8b6b06a/rii_keyboard_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a127854-da7d-4231-870b-a69d93cf88b2/2877643142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e292dcc3-fc16-4a36-a972-78acd4ff97f6/wogokategevigotadazepapeb.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/16687654370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501067db-5021-405f-b59a-05bdb7afc303/fodologefapovibimuzazufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b676544-dd29-481a-a0b5-5512b42253d1/zagusafopebetowuxus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73a990b-c6d0-4c16-b36d-1fb7e7209575/charter_spectrum_remote_control_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f86aa52-db99-4d3f-ab1b-f9bb82955bec/wise_services_wright_wy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c6b81e-5faf-478d-af5c-97e8d7c2df77/34809611402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8e3f07-fd9a-4484-bd3f-45f0984deff0/vuvage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0116d90-2471-46b5-b9a2-1b3838496b9d/99516382664.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 6168 bytes
SHA-256: 0499f30c81313a4388dc122b60e4f8f5029745434abf443e0ce133c82e90a58d
font_01_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 15952 bytes
SHA-256: b7c3058dbf1e4658b90f7720f564b8a0c65a5a886c57b690d3f12adb392ae80e
font_02_sfnt_off00013529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13529 16448 bytes
SHA-256: bc6d684f813ac1c32be8bd0fe15b7813cdddcd900b6f98dcbbe4bb93017ec79b