Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3aaedc4daf2c9cb…

MALICIOUS

PDF

71.6 KB Created: 2020-11-13 05:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0a1c60e15c9e5e561514d26a37a94aa8 SHA-1: e6268914784b358dbd3d1c1d4bb5e47c3f42f360 SHA-256: f3aaedc4daf2c9cbf648a3c2186766472b1245582be9758047f13514bb0bdcb1
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized URLs on platforms like Weebly, suggesting a link farm designed to obscure malicious destinations. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a phishing or malware distribution lure. The embedded URL 'https://trafftec.ru/123?utm_term=wednesday+wars+pdf' is likely part of this redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=wednesday+wars+pdf PDF link annotation
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8554420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_5f9d08bb3233e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5f9ffa3e8b773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_5fa82e696466e.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/bikikopozuk.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/kadudivisopuzugel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5f92269f6cbed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_5fa0cb8c34a6f.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/xojisaxun.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/5fabfae40caee8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/watajive/what_is_dell_business_strategy.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/35494087753.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/nedevowuso.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/how_to_say_hello_in_nicaragua.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 4760 bytes
SHA-256: 88e02688d8b4366713c94ee8230f16ff937bb8c6b90ffdfe02bc28ce352d85db
font_01_sfnt_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 11088 bytes
SHA-256: 176cb83c57dd384e662632b98ffd31baf07a4626f9d6889f7490b0a82bfa9f84
font_02_sfnt_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c