Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f6a33eea2ce739…

MALICIOUS

PDF

73.1 KB Created: 2021-01-02 21:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 427b8b0fd6adc35ff68090b63c60871f SHA-1: 477eb5ef5087702490b0a3a93740500f6d2e7358 SHA-256: c6f6a33eea2ce739924c7043cea7d8e9ea813d8619cb2efcb70293030cab014f
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, many of which point to external websites, indicating a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as containing a mass external link farm. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/wb?keyword=stick%20with%20god%20quotes In PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5fcfb46437f34.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/iasjigq/how_much_space_does_20_chickens_need.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/doferaxaw.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/ejhwoTJ/loop_yarn_baby_projects.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f94b57399eb7.pdfIn PDF document text
    • https://cdn.sqhk.co/tefivezik/f7id7jd/53812963822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403531/normal_5fa5c7eec3b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_5fa38e078576d.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/hjcdoif/arcade_space_shooter_games_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5fc90a845077e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54e45b7-d069-44ef-8657-48bf4c911437/fofutemi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/vobil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/309a76a3-f026-40a6-8a8b-ee01cc09043a/orang_orang_biasa_andrea_hirata.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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 5248 bytes
SHA-256: e7aeac50539c3e0913cb6814f233dd1969480b501b46d791df7af9a9a1cf468d
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 10300 bytes
SHA-256: f6d64231c16e91bd57ac64601a653a7fd613249c5d02399c842bf6d16b0abc7c

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