Malicious PDF — malware analysis report

Static analysis result for SHA-256 544928fc315db441…

MALICIOUS

PDF

66.8 KB Created: 2021-04-06 13:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8acf5bb77e413dd45fda08806c7f1217 SHA-1: 18f0186f0ee8504bf428eaf6a05a77c0a52f75b2 SHA-256: 544928fc315db441a24f71ae748eb5dfd0518c5466d9fc51594b6171ac846a31
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, suggesting it's part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=tomahawk+middle+school+tomahawk+wi
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/noloveleri-diworitokumasu-ligenodubavan.pdf
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5fdde0762d13d.pdf
    • https://tewutenuka.weebly.com/uploads/1/3/2/6/132695339/direfe.pdf
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5ffa0defbce56.pdf
    • https://xugoxuxilolikat.weebly.com/uploads/1/3/4/8/134860817/5611262.pdf
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/befutakipalat-xeladinubukam-movibazu-nuderafazavun.pdf
    • https://xufevojulan.weebly.com/uploads/1/3/1/3/131384667/754814953f3f.pdf
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/a1dda.pdf
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/453f28310cb.pdf
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/7259237.pdf
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5fd235f036e3f.pdf
    • https://palobakuk.weebly.com/uploads/1/3/4/5/134523632/1000688.pdf
    • https://cdn-cms.f-static.net/uploads/4416143/normal_602029f349413.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9cbdab5b-80dc-4eed-8ee2-f1f1daae2801/32482929456.pdf
    • http://lumaxixi.epizy.com/gourmet_traveller_restaurant_guide_canberra.pdf
    • https://uploads.strikinglycdn.com/files/644d1065-713d-41d7-a477-e0a0051804f9/muzalefaz.pdf
    • http://dopelafoxumamew.rf.gd/support_vector_machine_theory.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f6.bin
62739d80f72a905bb087e9bae992f034886aec0fcb6fc73fbd2421f4cb6750ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 5188 bytes
font_01_sfnt_off0000da86.bin
77edf8b617562273aa17211e682acc5681f09d5299a06222a86c0488cadd181d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 10532 bytes

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