Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72376cb58c1c8a1…

MALICIOUS

PDF

86.4 KB Created: 2021-05-30 11:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ffcb4b609463f6d5edc96a2cf0303bc SHA-1: 5d2eaae6fbf6d4b6883d27fe30efa15519b05292 SHA-256: f72376cb58c1c8a1e391c3650e3071b1fb80e7b5b1bf2d2b009c21952d061691
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=what+is+the+meaning+of+curriculum+vitae+in+english
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/4cc31921b.pdf
    • https://cdn-cms.f-static.net/uploads/4470689/normal_5fd96e58d5a1b.pdf
    • https://jadibezunapav.weebly.com/uploads/1/3/4/6/134610372/vakuzavifafegabosuk.pdf
    • https://papozigej.weebly.com/uploads/1/3/1/8/131858530/911323b944ef58.pdf
    • https://cdn-cms.f-static.net/uploads/4422627/normal_605309ba673d4.pdf
    • https://zomuguzilax.weebly.com/uploads/1/3/5/3/135327960/a10696b70a.pdf
    • https://folozulo.weebly.com/uploads/1/3/5/3/135351090/6332441.pdf
    • https://xowedoditigivi.weebly.com/uploads/1/3/4/7/134714126/9fb3e56.pdf
    • https://mogugadikawes.weebly.com/uploads/1/3/4/0/134096191/kutipadum-togonitutibuza-fuwojiruzagoj.pdf
    • https://cdn-cms.f-static.net/uploads/4368218/normal_604f55aa94177.pdf
    • https://cdn-cms.f-static.net/uploads/4366947/normal_602f92533ecd3.pdf
    • https://nixalimug.weebly.com/uploads/1/3/2/6/132680811/ribowufaruwugo.pdf
    • https://cdn-cms.f-static.net/uploads/4499005/normal_606ae2e2b8345.pdf
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5ff32d3f3ee0c.pdf
    • https://zugexegepu.weebly.com/uploads/1/3/4/7/134740595/kifodexalino.pdf
    • https://cdn-cms.f-static.net/uploads/4477921/normal_5fea168d728af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8a28fbd-c442-41d3-8a68-c63b87bf05fd/weather_worksheets_for_3rd_grade.pdf
    • https://uploads.strikinglycdn.com/files/9c9d383e-3a31-419b-b68f-e6d852a08774/why_is_my_rabbit_changing_color.pdf
    • https://uploads.strikinglycdn.com/files/f9a03bd0-feb0-4902-8c24-f17eefbfcc35/what_happens_in_fermentation_of_yeast.pdf
    • https://uploads.strikinglycdn.com/files/fa596ff6-5487-4ad8-98d6-d69223ba90b3/17795749434.pdf
    • https://uploads.strikinglycdn.com/files/9e391c6b-1909-4708-b650-1d15244e299d/pathology_practical_book_harsh_mohan.pdf
    • https://uploads.strikinglycdn.com/files/66d447ec-7d19-4cbc-a726-bd4b0bc5ac2f/25036365402.pdf
    • https://uploads.strikinglycdn.com/files/c374cb87-fde8-49c9-a1d1-8c2a5f68c986/falcon_bms_manual_4.34.pdf
    • https://uploads.strikinglycdn.com/files/ad5df664-65fc-49b5-94fc-7e03d2979609/pategifenojaraxuneza.pdf
    • https://uploads.strikinglycdn.com/files/8542a7e8-2b9e-4c3e-b084-ee9f572f199e/durajavelekavu.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_off00010dfa.bin
f24fc8ee42ce4858dc2c29177793027be0b96bb4eb5c641c3d2847afddbf2e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 5368 bytes
font_01_sfnt_off00012029.bin
ca30e0a2e2f663d70794b869310fe64e728ed1582f569dc20ce10b859edb76de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 12548 bytes

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