Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c892d1b01843be…

MALICIOUS

PDF

75.4 KB Created: 2021-03-27 19:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c3df9f328d6e68abb2e4c5d92fefc0b0 SHA-1: 59b17c42356f59a0a936e499e02a8269246d0a64 SHA-256: 10c892d1b01843be1398af710521a03824e7fabc2048a3efb1b2b0b951b82e05
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 0.9997

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=where+the+wild+things+are+inspirational+quotes PDF link annotation
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/rekovunik-gedad-narigev-degakomemibe.pdfIn PDF document text
    • http://buytoday.cc/91597202963y71dz.pdfIn PDF document text
    • http://sosed.market/sadisolumasagubizf13wq.pdfIn PDF document text
    • https://midunaso.weebly.com/uploads/1/3/4/6/134680252/4539582.pdfIn PDF document text
    • http://alisabor.design/poguvopn76a.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/sikaguja-zuvobizuwodeko-dalazaxodobufun.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/melisobisidakamunanu.pdfIn PDF document text
    • https://narobukedezupe.weebly.com/uploads/1/3/0/7/130738621/7555520.pdfIn PDF document text
    • http://copalofa.site/putijanenapevalozipsq542.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_0c868cecff3f4a4d8dd6c9d5e1224b5d.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_4c38f36b176643aaaa9a85d5063f2462.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/848fe0ab-7d1e-40c4-9ffe-d150970daca3/44165779146.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_a2fbb782daec42f2b0bcda14878bd896.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c9d769-6377-488e-909e-b2f5356df82d/9384492305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77fb1871-4690-4b85-92ce-d1e8d8490404/sowug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d8597a-9973-47af-86e0-00e8dcc1783d/como_hacer_un_a_word_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5759f16-34f6-48ae-b9dc-adb37bca5497/wemunumaxal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697f91e1-e060-4ab5-9a6b-a28621527d06/64718028403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d727c48e-78b6-4d01-a411-48abfb8f2390/ronebedufaruvinuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef528a3-9b1e-4f97-aeec-00ff67a8b6d0/26621925335.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_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 5452 bytes
SHA-256: 7efcd173fe1db45b1b8ed5b84905afa42fb6a216b910c30d40254a329b49566d
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 11124 bytes
SHA-256: 6a675aa2b3c4975744b6058f518652f40208347744598c162cd34cbf1c809c67