Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65120e9b171173c…

MALICIOUS

PDF

71.1 KB Created: 2021-03-03 08:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8eff4e8a857d79757cc997ce748f51d4 SHA-1: 8f08f35d77edca878a0c003ded7464b4703fe9cb SHA-256: c65120e9b171173ca867325e212a4af98c6d546f91782b09ecc5a9bfc78fd7aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a prominent one pointing to 'https://kuzutuzo.ru/strik?utm_term=wd+my+cloud+ex4+hard+reset', suggesting a phishing or scam campaign. The PDF's structure and the presence of many links on disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=wd+my+cloud+ex4+hard+reset PDF link annotation
    • https://radetotoko.weebly.com/uploads/1/3/4/6/134697609/laxojagopuzu-fumizepenap-wajuduzekik-mavurinurog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_600d278663b1c.pdfIn PDF document text
    • https://fujolununepa.weebly.com/uploads/1/3/4/6/134683680/gazufusutedawa-tavafesojatunu-dudidozu-bononotijo.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/ruxerukonadimum_moferemuxafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_60288dcd2576f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60280ba0bd929.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/8100685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460461/normal_60052e099f9cb.pdfIn PDF document text
    • http://kivedunorujuw.66ghz.com/mememixoponevezilaxuzoro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370778/normal_5fe559338f477.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexawisoza.epizy.com/zufaxosabikovezejo.pdfIn PDF document text
    • http://dapuvutajula.rf.gd/who_makes_kenmore_elite.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/57116471739.pdfIn PDF document text
    • http://lekekavom.epizy.com/nezasufegavefixagebux.pdfIn PDF document text
    • http://peburameg.epizy.com/26141168347.pdfIn PDF document text
    • http://mobisojew.epizy.com/povogukatajenukusa.pdfIn PDF document text
    • http://merojupamen.epizy.com/lego_batman_3_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/jabopoluvoxe.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/cement_sheet_screws_bunnings.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/sergio_chapelin_globo_reporter.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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 5448 bytes
SHA-256: 5dd49f6b2c0c7af7cb1912c1816d93692ecdd1aefb4b713c322b6f5bbcd3ce27
font_01_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 10496 bytes
SHA-256: 709cd6b65c0bcf8ffbae8cd9a1437e0f451b04798045e32cbb2644cb19f06c57

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