Malicious PDF — malware analysis report

Static analysis result for SHA-256 9678943fd42f79bf…

MALICIOUS

PDF

112.0 KB Created: 2021-05-23 21:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6639cdf1c5c6e67f87985cdf24cadf07 SHA-1: 0b0157eafd9fc929534e4b332406bb881037c482 SHA-256: 9678943fd42f79bf51ffccb8d0f8ae44850466c01543887fd231576583065513
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets, suggesting a link farm or SEO poisoning attempt. The primary URL, 'https://ponafet.ru/strik?utm_term=strange+vpn+apk+download+for+pubg+mobile', indicates a lure related to downloading an APK, likely for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=strange+vpn+apk+download+for+pubg+mobile PDF link annotation
    • https://lizoranulag.weebly.com/uploads/1/3/4/0/134041515/vizofedef.pdfIn PDF document text
    • https://pilumana.weebly.com/uploads/1/3/2/6/132683063/joseb_wusavutikozuwa_pipamefum_bejifedij.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/lerulal.pdfIn PDF document text
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/guvekasuja_vanomanizirefo.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/6549100.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/9074251.pdfIn PDF document text
    • https://judexesadizit.weebly.com/uploads/1/3/0/7/130738912/1371407.pdfIn PDF document text
    • https://pamimimafe.weebly.com/uploads/1/3/0/7/130775080/8076802.pdfIn PDF document text
    • https://sozugubew.weebly.com/uploads/1/3/4/8/134893137/tuvudum.pdfIn PDF document text
    • https://wafilanukeg.weebly.com/uploads/1/3/5/3/135309269/molaxido.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/fipijife/wovomepame.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/toro_724_snowblower_shear_pin.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/wipuxosezemobo.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/nelsons_ministers_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/html5_forms_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/gifasogakana.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/subazozibenosi.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/five_minute_journal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/mariam_khan_reporting_live_telly_update.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/bafg_antrag_hamburg_formblatt_1.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/rajujevogoseviwegarevilik.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/minexi.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_off000176c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176C0 5644 bytes
SHA-256: 401a20b0889e7a34d6950dfa2db918203699f4e87af1b21164ba1b6f793207f2
font_01_sfnt_off000189fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189FB 12328 bytes
SHA-256: 1b01960869349d00ea12222fbac1207afd08d9e32df2199bd9b924d18ad9a765

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