Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c80d0e55884d93b…

MALICIOUS

PDF

73.9 KB Created: 2021-01-06 04:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 440805e07a549fc5b39cb3be8276def5 SHA-1: 2827927ae26e7e79b7c321962cc5c8ecd6d9bae8 SHA-256: 6c80d0e55884d93b5fd70187a32ba3a5d20ccb839a4ea09248380563e5fdd717
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO link farming. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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://traffmen.ru/aws?utm_term=code+of+conduct+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_5fb2f3f5c46e1.pdfIn PDF document text
    • https://cdn.sqhk.co/sakixowofeg/2QggZgd/51745671182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5fe940b9a920d.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/c8c5f692c86d87e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8715a06276f.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/dazaba_wuvuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5fbbcf9c40825.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/daa0e.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/Ahjhfd8/84788908855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5fba87a80b2a7.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/zaxuledo/dna_base_pairing_rule_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/cara_menghitung_c_n_ratio_bioflok.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/dixetapudib.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/simogujizot.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/18654955060.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_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 4932 bytes
SHA-256: 8fcb01b8c75c568e3d1548a789f8be87345a16aab1ec3672f2c883d35112c919
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 10136 bytes
SHA-256: cd7f9dafb9de2d2e6587094463f7678418cc5ac3549ea106ae420cbff874fc25

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