Malicious PDF — malware analysis report

Static analysis result for SHA-256 656a24627236f9ca…

MALICIOUS

PDF

67.1 KB Created: 2021-02-17 09:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2176682caf8cdb1c55ba021ecbd4239f SHA-1: 5540a452efa4278860ad7ad6a45443a3d30f581c SHA-256: 656a24627236f9ca1c5f5ce1da821d3a4d43c48cdb9ed8d4464ead0f6e317ce3
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains a large number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, suggests a lure related to 'the professor's house pdf'. The presence of numerous external URLs indicates a likely attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=the+professor%2527s+house+pdf PDF link annotation
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/niroxedog_japixakazutufe_joxatorivetuj_rigigavu.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/jikegopisixofipubem.pdfIn PDF document text
    • http://gnoogle.site/femewukodixebedowaxa58cff.pdfIn PDF document text
    • https://nefakemibozike.weebly.com/uploads/1/3/5/3/135314079/gowin-jobovoxabunof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445733/normal_6002d9a815b22.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/c4cc69.pdfIn PDF document text
    • http://ita-bio.space/sky_warrior_clinicjjmcy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_5fe9388ae35cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_602809de2eac8.pdfIn PDF document text
    • https://pebevakulowuju.weebly.com/uploads/1/3/5/3/135323022/74e3d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371025/normal_5fc899cb0395d.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/ronatiduzoxij/almost_a_hero_guide_500.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/horizontal_analysis_of_balance_sheet_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/free_color_wheel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/49718362263.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/adobe_media_encoder_cc_2014_free.pdfIn PDF document text
    • http://zumoriko.epizy.com/xolalaz.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_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 4868 bytes
SHA-256: 49d926a6cf61dbb613b5c4ac864c9620b472ce10e1051b42f89c1f62a1609974
font_01_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 10364 bytes
SHA-256: 1974b5031506a33cb5c7544078a0cde70d92f9d6d3f8986f2d899ea21b8fce3f

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