Malicious PDF — malware analysis report

Static analysis result for SHA-256 103322a44b1e639a…

MALICIOUS

PDF

91.1 KB Created: 2021-03-19 08:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afe61635b5d60b4bbc93861e5d487f97 SHA-1: 807bdb78be74179689191ad22585eb68940ffa99 SHA-256: 103322a44b1e639ac767b536ad6d47a1bf7ab145d62ca42b484e47f32df40513
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/strik?utm_term=which+bissell+spot+cleaner+is+better
    • http://blekrossi.ru/eba_guidelines_outsourcing_agreementslri7h.pdf
    • https://cdn-cms.f-static.net/uploads/4379035/normal_60298ec0e385c.pdf
    • http://replyua.site/51613249874a5dzq.pdf
    • https://cdn.sqhk.co/roretuduva/jetjc7v/cracker_barrel_thanksgiving_sides.pdf
    • http://kuvenumine.mygamesonline.org/16405196129.pdf
    • https://cdn-cms.f-static.net/uploads/4496824/normal_6021029173c88.pdf
    • http://itclick.info/213907005141m1ws.pdf
    • http://vakekaninu.iblogger.org/22737094010.pdf
    • http://generalmassage.online/arctic_ice_sheet_thicknessnilum.pdf
    • https://cdn-cms.f-static.net/uploads/4472484/normal_6038bb0224e42.pdf
    • https://cdn.sqhk.co/mudinaxape/i3gcgjD/formula_careers_openfoam.pdf
    • http://jusogowir.22web.org/biblical_theology_of_leadership.pdf
    • http://xuvaxujogilo.mygamesonline.org/zedoxulowutedaxorilalavo.pdf
    • http://lorenbayi.com/all_types_of_poemsvx56x.pdf
    • https://static.s123-cdn-static.com/uploads/4402014/normal_6005301901ec3.pdf
    • http://ragofilud.medianewsonline.com/15301031408.pdf
    • http://reduslim-eu.site/bollywood_best_movies_2018j6k5j.pdf
    • http://labincom-med.ru/219620047530ktvo.pdf
    • http://nadozigipak.22web.org/scala_rider_g4_review.pdf
    • http://gajaxujifusokul.mygamesonline.org/vitideki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dejifiragilu.epizy.com/history_of_islam_in_urdu_books.pdf
    • http://begosene.epizy.com/dizon.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_off0001283c.bin
dae9af66a3aaaca564200d299311311baf6cec4a62af60b134d7aa293f7295be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 5176 bytes
font_01_sfnt_off000139d8.bin
2e23d8db8124a7e1152f3308e3b1f292588746b407f67930aa8e6d93f01d2adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139D8 11040 bytes

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