Malicious PDF — malware analysis report

Static analysis result for SHA-256 712148b7cc42477d…

MALICIOUS

PDF

73.4 KB Created: 2021-02-17 17:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 49574f253020f8b7ae9bd0798a56a5ef SHA-1: 167c8c072f3ae26995018971a92b269a5b6f5b5a SHA-256: 712148b7cc42477d2d841003268e1aa7f90b9ba8ebb185568d53f5b72db26fa7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=can+you+exercise+with+diastasis+recti'. ML classification and ClamAV also flagged this file as malicious. While no scripts were explicitly extracted, the presence of a malicious URL strongly suggests an attempt to lure the user to a compromised site for further malicious activity, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=can+you+exercise+with+diastasis+recti In PDF document text
    • https://dufebekeromodi.weebly.com/uploads/1/3/0/7/130776386/2880828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fffa0b969ee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385859/normal_5ff8d6f132c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_5fd712ada6736.pdfIn PDF document text
    • http://susobokilodos.iblogger.org/11342848006.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/gudibivetik.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/komuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5fc7db04e1704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fc8a1a204f41.pdfIn PDF document text
    • https://lomivemaj.weebly.com/uploads/1/3/0/7/130739076/busilivopilozuxas.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/79f5f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_6016d309ca51a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_601708b0c0c1f.pdfIn PDF document text
    • http://getbuiss.online/41341970269y1x7n.pdfIn PDF document text
    • http://allieshouseofhope.com/892449489011kfvf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381997/normal_600bd7364613e.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/petubapizo/celine_dion_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/plural_nouns_with_s_and_es_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/game_boy_gba_emulator.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/37691522614.pdfIn PDF document text
    • http://kezatafoxab.epizy.com/vaxiwularutemafabuz.pdfIn PDF document text
    • http://rifovixo.epizy.com/effects_of_pollution_essay.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_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 5164 bytes
SHA-256: c0cf5992ec18d725a31b58f7c6f210076b1b523914f989ce5f95f9307ba5fca0
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10856 bytes
SHA-256: dc419944a8d610e7f385107f340d795d5d36a5c3fd689f719c08b3b52a5e01b9

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