Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f0c1049202b18f…

MALICIOUS

PDF

116.8 KB Created: 2021-01-04 23:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 16d5c76ccf367b9bee1afae060827282 SHA-1: 75938f733b0511f3aa0e8587f354472a2ff68217 SHA-256: 17f0c1049202b18f6227b8c1b983d5e0cddfc08d691a905cfcec9412ad1b93ec
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, specifically for containing a link farm and redirecting to known malicious infrastructure. The presence of embedded URLs and the ML classifier output strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the PDF and its embedded links points towards an attempt to lure users to malicious sites.

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://traffking.ru/123?utm_term=not+so+berry+challenge+sims+4+names In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fa8ecd61e895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5f8c0976c6775.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/849142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_5f99ee4354d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5fc3278159c8b.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/wwffjeU/best_warhammer_iphone_games.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/68c201d8-e333-43d5-bfc1-12636c6df2e3/79213461778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec3a026-92b9-4a39-b82e-8ab5a824c5e6/mogizafefuwenuboweguzano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62886e4d-bf8c-4884-a643-2d737bb3da7d/kasije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10c26f4-d9a5-4bdd-a0ee-171c6904c806/55389577916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5118a9e8-1a3f-4f5c-ba47-a13ac500c9db/juzuxibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3a2739-35ae-493e-9613-b023ec53a3cc/paxuwurejoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa5b569-d8d0-42fa-9dec-c2c3db6f2f68/gomira.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_off00018af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF3 5512 bytes
SHA-256: 474f8d10ef1086a2fd6be1822e4c740d3274a7d66a7505fa9681ff574949ea8d
font_01_sfnt_off00019d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D9C 12368 bytes
SHA-256: b14f143db6e39e9d10b42a0ebf5e634804dbbbc5e818655ffdc0621636b4b3cf

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