Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf3135898f29a8f…

MALICIOUS

PDF

68.6 KB Created: 2020-12-18 08:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4ec184706ca0c3fccdbbd7916de54fa6 SHA-1: 85cf5b35e75cbd65a4d3fc007a40323c966f4943 SHA-256: ccf3135898f29a8f123a99f0d201fedb2fd39e3d023a5d74ab5f664f10bc25c1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and external links suggest it's part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?utm_term=toyota+way+2001+pdf PDF link annotation
    • https://gokejubekilebu.weebly.com/uploads/1/3/4/3/134376129/xawiropugeg.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/76cfdda48.pdfIn PDF document text
    • https://buxexuwuf.weebly.com/uploads/1/3/4/6/134660927/c24a0.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/2e5c26a8-84ce-43b2-b2bf-3280091aab85/little_caesars_essex_vt.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1841caffbf90a66eed52e/t/5fd02954125f6a657a436d64/1607477588870/hmrc_vat_rates.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/78659592324.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/4_lines_poem_on_moon_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/75123084483.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/godzilla_vs_biollante_final_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/78423411748.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/97631695258.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/83040487547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d59d73-d320-49ca-b0df-768cfde00076/sonasudosanezexo.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_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 5196 bytes
SHA-256: a5bb35b085569622825f7113d892b0c5f1f780a7dfac604946daf66cc438c872
font_01_sfnt_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 10344 bytes
SHA-256: de806f23725dd09dc3083dcc0f3f8703b2caa6971b0af72f93eb0a07f1515774

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