Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df1295a9049b4a9…

MALICIOUS

PDF

79.0 KB Created: 2021-04-17 12:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9638022224bea2b60ba63a434fd68db1 SHA-1: 08338cb276ffc85e391f56220fe11f1e73f0c814 SHA-256: 7df1295a9049b4a9fa99377f5221660e61f4e0178f452b22749ec726fce803cd
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure designed to obscure the final malicious destination. Heuristics indicate a link farm and a malicious redirector, with one URL specifically identified as a lure for 'book report outline template college'. The ML classifier and ClamAV detection strongly support a malicious classification, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=book+report+outline+template+college In PDF document text
    • http://jepisafidezegun.scienceontheweb.net/88607428546.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/tabokadojararez-lunariser.pdfIn PDF document text
    • https://lesesagipamagaz.weebly.com/uploads/1/3/0/7/130739561/b91406.pdfIn PDF document text
    • https://bijesuvudapij.weebly.com/uploads/1/3/1/8/131860553/51359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_6013db88c42a3.pdfIn PDF document text
    • https://nupariredarig.weebly.com/uploads/1/3/4/3/134357859/rumodadakefixen_katogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_605901a13983a.pdfIn PDF document text
    • https://punizino.weebly.com/uploads/1/3/4/3/134327780/f541626ba967.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/37714995862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_601d5e9969166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rorulapuvutoj.epizy.com/femilugeboluj.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_6acf863b1b5f47faa83a7592754379dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/foneniz/44146223208.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/business_communication_skills_course_in_pune.pdfIn PDF document text
    • http://fururebinupi.epizy.com/best_reader_ipad_apple_pencil.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/vixoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/ralut.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_5ec726f2389a4cf08a5e9e32653555d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/powamoxib.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/mowipodutawalelegavim.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_f4dada07224a4e0cab24673cb340aa04.pdf?index=trueIn PDF document text
    • https://71b34470-2e60-4936-811b-9f14cb47e32b.filesusr.com/ugd/1dbbf0_30c409e0203f4082a7ed2adae4661e7d.pdf?index=trueIn 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_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 5188 bytes
SHA-256: a7d642df2145d75a77418ed3460e567d4effee6f206209d4fd5c3741714ca48a
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 10944 bytes
SHA-256: 910af640ff4be6b748521964f292b61c90cda84151279f0c5ed3883a7cc92406