Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b6cc813956a86b…

MALICIOUS

PDF

77.3 KB Created: 2021-02-23 19:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7ac180a0f56e8c9474c6f3368970b1ad SHA-1: d94e1bddb7bdacc240a98260246e9b52de19db48 SHA-256: 62b6cc813956a86bc969cba63a126c4c8192f39eed868bc32922134dd9e4c0d4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One of the embedded URLs, https://yafferge.ru/strik?utm_term=separating+john+updike+quotes, is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • 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://yafferge.ru/strik?utm_term=separating+john+updike+quotes In PDF document text
    • https://lazofakivew.weebly.com/uploads/1/3/1/4/131406449/daguruxanuki-netukixer-seperi-tozeg.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/vokapopefuwojeza.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/kYOqhfc/rukewu.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/hjqtOjg/9619948379.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/bewuzitevozumagixot.pdfIn PDF document text
    • http://lozhobelir.space/all_dungeons_and_dragons_books_free_download1ohdr.pdfIn PDF document text
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/6a95f1cfecc.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/Bichea1/xalezefofodegugi.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/fadedosi/nogekup.pdfIn PDF document text
    • http://fukasutatota.rf.gd/guide_hermitage_museum_st_petersburg.pdfIn PDF document text
    • http://lugimes.epizy.com/38643672390.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/barreras_actitudinales.pdfIn PDF document text
    • http://mevumum.epizy.com/76182339030.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/free_latest_avast_antivirus_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/75005503012.pdfIn PDF document text
    • http://dupivet.epizy.com/surugonupufiwu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 5560 bytes
SHA-256: 84c98f3ac066697de6d5917650ebebe97811dcd8731ab2b4e52a777cec3ccd40
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 10800 bytes
SHA-256: ba5b9175d7e2b836b3d3bce65cf04022f295f613c4fc17f8c0d656dc362dfbb7

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