Malicious PDF — malware analysis report

Static analysis result for SHA-256 493ecd12cef31198…

MALICIOUS

PDF

69.7 KB Created: 2021-03-08 18:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 48a23b7351e1ec54af632ccbc9857820 SHA-1: 1ed40b98279aa208d18abc82a6637eadf4963df6 SHA-256: 493ecd12cef311984ef792ad6456fb584490b2fb15f200f2745f89aa028fd6ad
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 0.9998

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://xajibur.ru/123?utm_term=color+smoke+png+hd PDF link annotation
    • http://usene.xyz/wunutrdtll.pdfIn PDF document text
    • http://webpost.pro/36720443584x1rj9.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/rebike.pdfIn PDF document text
    • https://mebijanuwirat.weebly.com/uploads/1/3/4/0/134042853/9512389.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/fixurulurafovip.pdfIn PDF document text
    • http://italywow.space/woodworking_projects_that_sell_good81wpv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_1d31c07d8763451c845dd48f778a7086.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_c384d14c70a14e32bd82fdf72a4e7275.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_4d23e59c7ae145198999804390ba5430.pdf?index=trueIn PDF document text
    • https://bbed0a08-af28-4ff5-ab4a-ae169e9179ec.filesusr.com/ugd/1b0481_4845bd20df4641b68c6066e88af67a54.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_9fbf7bdc346040e58ff03477efc151e1.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_ec6ab3d940174ca1b3f4cfb5eb309365.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2982a16-f9e7-45fd-a25e-d898ee3c1540/fowava.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_13ba42ad56a44f8d84c002b4e6d1b75a.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_170c3a3cb0e34109aa695c8089d0f4cb.pdf?index=trueIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_e461301f3a5e4e2d84932f3a80b8dc1e.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_c8fd883ac7a242f48da263c7263971b6.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_3acab1a16d29405ea7c74d0f460b038d.pdf?index=trueIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_bbb6a658438c4bd7b48f052db3aa5cad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcbad7a6-4cee-487d-8e95-14fa94a62484/what_is_healthy_at_taco_bell.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 5132 bytes
SHA-256: dc8405bb47e731d7bcae54a96d11e72c484d2cbd8176d61e12be9d21837c2351
font_01_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 9924 bytes
SHA-256: 80c25185c5d6e588d3491d4b9e8459a8093c6d2055904e5d0ea1d06f4770f000