Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3b34600b8e2449…

MALICIOUS

PDF

82.5 KB Created: 2020-11-10 14:12:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 69000dc46ff974efddac3fe0fcc9bb40 SHA-1: d47b64c94a4d8042e8f1a8ad1b5a8e447d4fc579 SHA-256: 0d3b34600b8e2449eeb20787b0f6eb7f43fc712055451c6646001910edbe5525
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on Weebly subdomains, suggesting a link farm designed to manipulate search engine results. One prominent link directs to a redirector URL, likely serving as a lure for users searching for free book downloads. The ML classifier and ClamAV detection strongly indicate 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://traffmen.ru/strik?keyword=i+am+number+four+series+pdf+free+download In PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/5615478.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/5182465.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/tigomujevilet_vigiwemuxatodu_xewoxezu_repofazum.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/zefevise_segefoso_funojap_badusuzazu.pdfIn PDF document text
    • https://ziroluberunoreg.weebly.com/uploads/1/3/4/4/134456507/5aac35182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f870bea1f480.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fenoz_perujopoxejim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_5fa8f78920f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_5fa1ed9f12bba.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/jamokaroxoj/vujifinefekonugaseralazow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d67a20b-b51a-4ba1-8643-ae09a12c4310/dorakevudirotosos.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/connectors_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/rolugovobafubema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d830b31c-4e53-4dbc-a592-155a24d5b9f3/integrated_advertising_promotion_and_marketing_communications.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/lolugo.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_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 5356 bytes
SHA-256: 22e3063e1f8ad3b96057007564f1ac0156bc59a147d16fc1316b37e006535bd0
font_01_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 12516 bytes
SHA-256: f261de133b8477909e43cbfa26319bb4574353bb10d752cdc12b873d6231d2a0

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