Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a95bde44e5140f…

MALICIOUS

PDF

64.8 KB Created: 2021-06-09 07:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4875769263ad92a986b1e2b224deabb0 SHA-1: b70f619e62c239807fd1311ef41145bb7bbef1e1 SHA-256: 36a95bde44e5140f298100cf60a62984a93885b0becb802429857599d1b667dc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/pbw?utm_term=o+bhola+hai+bhandari PDF link annotation
    • https://sevujamipoviku.weebly.com/uploads/1/3/4/2/134234740/8790406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5fc745c5d110d.pdfIn PDF document text
    • https://kikeletiwemuk.weebly.com/uploads/1/3/4/6/134671512/xadusenetekibufob.pdfIn PDF document text
    • https://xuxefaposil.weebly.com/uploads/1/3/4/3/134393683/dudiruvadute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_60544ee9b9630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453528/normal_5fec2476cc62b.pdfIn PDF document text
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/9511476.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4380228/normal_60b550572ccc1.pdfIn PDF document text
    • https://lewumirobubav.weebly.com/uploads/1/3/4/7/134762292/8712748.pdfIn PDF document text
    • https://zokexeti.weebly.com/uploads/1/3/5/9/135966989/3728780.pdfIn PDF document text
    • https://fukuzemuk.weebly.com/uploads/1/3/5/3/135306557/pifuruwutiju-mapufuzosev-mobavak.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/kidinikiwaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_60376ad2079ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://papoxuva.pbworks.com/w/file/fetch/144425280/kof_98_um_ol_apk_asia.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/w/file/fetch/144917787/96206983638.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/f/topulovixumesukufupudig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a336a7f4-7cfd-4a0c-bd48-d888fb2cdaac/xotelajotonufate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807bca13-4120-47e3-b52e-7eed9fe57c48/vixubepokavuvikovix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4748597-a545-4a36-af24-ea6e83e17b60/75447311593.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_off0000c3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 4904 bytes
SHA-256: ef980159fc10df4c758428245dcf1e5d1609142ad88fdcd657fb1da0d661eb8d
font_01_sfnt_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 10004 bytes
SHA-256: e1db661a0767e87530c33fb64cb86de20c0c54f88fc78d7625471d36ad9ecabd

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