Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0fcfea9128293e…

MALICIOUS

PDF

78.7 KB Created: 2021-05-28 08:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 91f1810e6527705bfc1648aad88531a7 SHA-1: da44c1e2d107453f46445ff8866c3b71062e092a SHA-256: ef0fcfea9128293e5b6c9ac40a97671d2c9a31623806df903906d3712d997594
226 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. It uses a password-protected-archive lure. 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 0.9990

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/strik?utm_term=crack+serial+number+for+nero+8 PDF link annotation
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/3f4bef0384f.pdfIn PDF document text
    • https://fadurobudafeme.weebly.com/uploads/1/3/5/9/135959894/1490635.pdfIn PDF document text
    • https://kujufilobi.weebly.com/uploads/1/3/1/4/131482850/lofoxu-rojejoza-poxebenupenino-kijelusukelog.pdfIn PDF document text
    • https://newosupileseru.weebly.com/uploads/1/3/2/3/132303396/59d285fe0d1.pdfIn PDF document text
    • https://juderesovabivov.weebly.com/uploads/1/3/4/6/134680251/4630bbc552c3.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/fowezowox.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/mugene_wuzozixukexijo_mixurufajos_zijiwid.pdfIn PDF document text
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/5598309.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/jenirasevefilitelun.pdfIn PDF document text
    • https://gefozovunipor.weebly.com/uploads/1/3/4/5/134585144/9989574.pdfIn PDF document text
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/kabegemonukux-vizujijavavixex-mezenem.pdfIn PDF document text
    • https://tofeligekejogen.weebly.com/uploads/1/3/4/8/134873344/robuwifisazuwakexuka.pdfIn PDF document text
    • https://pobanuritixejun.weebly.com/uploads/1/3/4/6/134601578/04579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367960/normal_5fc620434716e.pdfIn PDF document text
    • https://womagojewe.weebly.com/uploads/1/3/5/9/135961056/6c9e63ca45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_5fd2c4e2c83ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417212/normal_5fcc8ae50191b.pdfIn PDF document text
    • https://boxulovakifev.weebly.com/uploads/1/3/4/7/134705425/ferib.pdfIn PDF document text
    • https://duzopuxezofuj.weebly.com/uploads/1/3/1/3/131382696/xamegozabaguvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_6059a149327ec.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/wekuvefigeliza-vexelumabegopox-zexaxal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5fd64b961cc66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1df142e7-5722-4a06-b06e-f05824c69ef4/wipugudewegobavisenuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516c57e7-8e1d-4a90-bb56-25d3b4a0ee9b/shure_slx4_antenna_switching.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ec1cb6-437c-444b-8abe-a8e85514f3bd/kitabobub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 5252 bytes
SHA-256: a0357b16c60c357ebbb37d6febd85fd3f0a8a3243eef4a99b37fabfc7afeb828
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 10708 bytes
SHA-256: 2973390dcead9b38563fa0df371b91ca59fee51d2138c8d419dfaa74265621fc
font_02_sfnt_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71