Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c40963155033817…

MALICIOUS

PDF

78.3 KB Created: 2021-04-30 05:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fa3184b96f8ddbf5b86aa45a56ba4166 SHA-1: ebd39904619cbb0cdcd48a0daf89523bb687e3b8 SHA-256: 0c409631550338171cb55345de0b39dcb81e2bf7dc26675293c0a366882a5f23
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9996

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=sears+craftsman+90+series+shop+vac+manual PDF link annotation
    • http://lowevujum.iblogger.org/7326270744.pdfIn PDF document text
    • http://wugilunage.iblogger.org/zijikunasur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_605a7d8617794.pdfIn PDF document text
    • http://wasatosu.sportsontheweb.net/69202707602.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/55360971555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_6029d2fdace75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378167/normal_5fe03163acffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486354/normal_6061b0b8bb29c.pdfIn PDF document text
    • http://mowukedova.mypressonline.com/26966145453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_60139fdf0ed5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_602d2d2b35846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_6048045ea490c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_603b7b60e7b45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miripiwamaza.epizy.com/accessible_canada_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501ab4dc-0d3a-4932-83ee-b417d3e61baa/how_to_improve_a_truss_bridge.pdfIn PDF document text
    • http://sajipesexadagon.epizy.com/order_of_ecclesia_boss_rush_guide.pdfIn PDF document text
    • http://duvowukuvemilo.epizy.com/what_causes_a_diesel_car_to_lose_power.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_b976e74666f74aadac6d72e8bbe916ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e3c5c2-3f6a-4dd5-9899-7cbc91c51bac/taxazit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ca2a18-d72e-4e16-92c6-fbd28d3a5de7/22881956568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb31b18-f308-4d0f-a88b-da38377544f0/ao_smith_promax_water_heater_40_gallon.pdfIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_50ec54bcd3274b1985c3713dc803ff19.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_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 5716 bytes
SHA-256: 90dc4ebc9b7fe1402e24075932e6131c5f7f376e794a8e029efdb7c3641639a2
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 11904 bytes
SHA-256: 5aa9db5adc13ff63b886adf2b9e626a1392893afa719903d52171eadf57e93aa