Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91148ecbeb73609…

MALICIOUS

PDF

73.4 KB Created: 2021-05-11 11:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 01d2439eeda29113c25710b07b70566f SHA-1: b2d568d036826bd590d3913db536d7497f8934bf SHA-256: c91148ecbeb736093e6324a9dc1d5b13ec2809a72bce127adb17961a240fa442
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://druttle.ru/strik?utm_term=how+to+measure+ring+size+uk+online PDF link annotation
    • https://mogivara.weebly.com/uploads/1/3/2/7/132712472/nepiza_wopasuduxenex_nilemi_nukaboludebuvav.pdfIn PDF document text
    • https://jodemugibinid.weebly.com/uploads/1/3/5/3/135347277/kuzizimib-lubezuzidojaru-nuponepito.pdfIn PDF document text
    • http://bafutazipavev.iblogger.org/10338025248.pdfIn PDF document text
    • http://jigofajun.22web.org/40832941871.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/fiwanazex_witarep_wegufiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_427fd6dd83b641bf8608cf682be82461.pdf?index=trueIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_97574cbc716048b38b5f707a3e04a8e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/8118314315.pdfIn PDF document text
    • http://dikuwipesunebo.rf.gd/bamibujikokekidum.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_124746ae097747b297752a6f410613df.pdf?index=trueIn PDF document text
    • http://roloverat.rf.gd/printable_calendar_january_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/podusoxezebefo.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/how_long_international_mail_takes.pdfIn PDF document text
    • http://fevifixe.epizy.com/mastering_biology_chapter_2.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_7908177e2960416fb31731069f6565b8.pdf?index=trueIn PDF document text
    • http://kovudefimure.rf.gd/ributipasetexozukitotate.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 5172 bytes
SHA-256: 4ee26ecf07b2884fb551e158eb768183a6326ef31bbc77553be6c24978023280
font_01_sfnt_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 10872 bytes
SHA-256: 4e1ef82eed5c7a8f17780762a7acbcb0fb6e3acbbbfdd29c6c67c253623d2d82

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