Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b60bc03569f22b…

MALICIOUS

PDF

75.3 KB Created: 2021-02-28 16:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 370358cfe3c65f7921f0b97b27023350 SHA-1: 989c13f56f1609d3e316e87bbead3b9b836e3b09 SHA-256: d4b60bc03569f22bb5f0edab90f824023047241e92c66a7702bbd93bd8558245
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics as a malicious redirector and for containing a link farm. The presence of numerous external links, including one pointing to a known malicious redirector, suggests an attempt to lure users to potentially harmful content. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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+love+from+god%2527s+perspective In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490754/normal_603b615fcd25a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473651/normal_5ff78dfcec5eb.pdfIn PDF document text
    • https://kixofugowewo.weebly.com/uploads/1/3/1/8/131872146/dajixumap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ffd832d21843.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367912/normal_5fcf9489943e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_6022d1c3bd511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_603ab4f68cea1.pdfIn PDF document text
    • https://timodidub.weebly.com/uploads/1/3/1/3/131379596/wuxilaneba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_6018d5d6c714d.pdfIn PDF document text
    • https://mumanewuneju.weebly.com/uploads/1/3/2/7/132712109/21c4ba7f7.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/iigZwYg/95927055926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497650/normal_5ff04970956f2.pdfIn PDF document text
    • https://suzabotofofetab.weebly.com/uploads/1/3/4/7/134739937/pasojel.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/somisilegex/disukedabumasuwija.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/taziduvipekatipedilofubif.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/chrome_ca_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/designs_for_powerpoint_2013_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/allegiant_hollywood_movie_tamil_dubbed.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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 5676 bytes
SHA-256: 1e66047578eaae7c7bd45a1db39f5ad9c519a50e989774985a6db2679bad62a1
font_01_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 10876 bytes
SHA-256: b330ff4c1b60af78aee90853b43c5aea3802ae9597328b29bf268aafed711970

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