Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb5442a37ad31d0…

MALICIOUS

PDF

65.5 KB Created: 2020-11-17 08:29:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9f468bea5e36acac46ef29edf74ebd22 SHA-1: 2f7e649fd886f0d9c85145bb80c083c1e27bde34 SHA-256: 3eb5442a37ad31d0843b0ab4d46c1cd4f7adb8f05a43106baaf6ca1190ed1ed2
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass external link farm and an image lure linking to an SEO redirector, indicating a phishing or malware distribution attempt. The primary malicious URL identified is https://trafffe.ru/123?utm_term=cai+luong+luu+kim+dinh+bach+mai. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffe.ru/123?utm_term=cai+luong+luu+kim+dinh+bach+mai PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f89603453f0c.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/2250669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f88ee474b7e6.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/9a3299f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f8cf0375ef71.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/89c1dd5c-1a54-4b0f-87ad-bb1b2f607d6f/8079945177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9688e209-88de-49cf-9620-75a21e20f392/cu_thuc_cho_cho_mo_l_cy_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fa30ba-2d43-46ed-a4df-321b936a87c1/64776083155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3c7ede-a2e1-4bea-96e0-5cc934ea0c07/76163105705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342f6afd-36d5-471a-ac11-f5b8b0dc3d7b/lezumudefipifusuxibuzij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60d9883-bed2-4a61-ac6e-293861656d59/3519571147.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_off0000c46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46E 5188 bytes
SHA-256: 7cf5a55e2fbce810d68332b708d79fa804ae8495e8439caddc6b98879cbf8cda
font_01_sfnt_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 9904 bytes
SHA-256: 1c4f5ba0cdcc1f310bcd169db4121b150866a46eb2db9f3386885b2744894910

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