Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0dac77e6fd8bea…

MALICIOUS

PDF

75.2 KB Created: 2021-02-14 17:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c99b40890ccb7a9b5b543fc4f383c3d5 SHA-1: ccfa5e060b7f141389153202d93351b624e53ffa SHA-256: 8c0dac77e6fd8bea1f6f0c47aff8841ebafc0e7320b39eacd25e4970b5c5fe7a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, characteristic of a link farm, with the primary URL being jottigo.ru. The document body is heavily obfuscated and appears to contain metadata related to wkhtmltopdf, suggesting it was generated programmatically. The presence of numerous external links indicates an attempt to redirect users to potentially harmful content or phishing sites.

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 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.
  • 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://jottigo.ru/123?utm_term=30+cups+to+gallons PDF link annotation
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/8049285.pdfIn PDF document text
    • https://sugokumorol.weebly.com/uploads/1/3/1/4/131437576/wamosus-dolivuguzorilup-nugezevuzujapip.pdfIn PDF document text
    • http://ipatovaalena.ru/steven_universe_attack_the_light_apkp2kpz.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/d61ea0441cac88a.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/xevegakerefowe-sujudibozezi.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/yhasjdI/tufoviladuzowefaxoxalis.pdfIn PDF document text
    • http://harkateine.fun/mary_did_you_know_piano_sheet_musict57n1.pdfIn PDF document text
    • http://endi-itali.space/xivubejavokwtfq2.pdfIn PDF document text
    • https://nikirepe.weebly.com/uploads/1/3/4/7/134743809/wovojasu-dinusukizi-lapopefos.pdfIn PDF document text
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/11a01165ce1abea.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/jOhfjju/agricola_all_creatures_big_and_small_solo.pdfIn PDF document text
    • https://fofomakizu.weebly.com/uploads/1/3/0/7/130775640/c957d637b3f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/vupewerirugobabinijuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/33280543787.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/marketing_plan_for_small_business_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/celgene_rems_enrollment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/xuvibajakofogiga.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/63462113488.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/mawipamujazezatozozulosa.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/column_subtraction_worksheets_with_carrying.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_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 5216 bytes
SHA-256: 4bc8df1a0ef9e58b02589143e727d262156aafc635766c6baa912110b95f8000
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 10568 bytes
SHA-256: f0bf465bbb229404dd0cb177437f997f46cbda2b035d7a48cc6d9427a59e9a7e

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