Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead73c12158ccaf1…

MALICIOUS

PDF

90.9 KB Created: 2021-02-15 20:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fb6aed61a6c12f9264a3a46f25c0f604 SHA-1: c8311cb2f483a49878187189704984578a4d585e SHA-256: ead73c12158ccaf1235a1c74a9dac1341e499c0ea1f5047e80f8c486384c72e0
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm or phishing attempt. The primary malicious URL identified is 'https://crophysi.ru/strik?utm_term=what+is+the+best+book+for+sat+prep', which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains text related to SAT preparation, likely a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+is+the+best+book+for+sat+prep In PDF document text
    • http://jagidevivuvu.22web.org/7353983414.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/tolivoz_dugewozudu_selabunotixad_kixibikanixi.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/dadojukulalusiti.pdfIn PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/ee72a1a0a11.pdfIn PDF document text
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/furoxiwonekorobes.pdfIn PDF document text
    • http://winoorama.site/59269163478hghrt.pdfIn PDF document text
    • https://pewidujatiw.weebly.com/uploads/1/3/1/3/131381722/nubutumepife_rojonixuboner.pdfIn PDF document text
    • http://mukanoderike.iblogger.org/ff14_praetorium_tank_guide.pdfIn PDF document text
    • http://thedouche.xyz/49805201614lubuy.pdfIn PDF document text
    • https://vopasigujar.weebly.com/uploads/1/3/0/8/130813381/6721303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejanubotikepiw.rf.gd/poe_quick_leveling_guide_3._0.pdfIn PDF document text
    • http://nilifujajug.epizy.com/9303749473.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_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 5176 bytes
SHA-256: c7fd5cbd438aeca43c292db7476ddadc0b50f79b751af67c54303a93ce9bb916
font_01_sfnt_off000139be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BE 10740 bytes
SHA-256: f4f9b93f1535b0eba1bf0d43cd267e47c40249410ec47d31cc668338c0b6433f

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