Malicious PDF — malware analysis report

Static analysis result for SHA-256 709ea7c44640683d…

MALICIOUS

PDF

78.5 KB Created: 2021-03-19 21:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d67790a698536b6d4e03396e8767866e SHA-1: 1c5cccb953e21118f49ec0c3fa42ccd1b63169e9 SHA-256: 709ea7c44640683df7ede4ebaa5bfb85b4173298b58c21e4411f2a2c6ea5fc1f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=proform+comfort+stride+elliptical+reviews
    • https://vigagexagadip.weebly.com/uploads/1/3/1/8/131856194/7b9af4e108eb7d.pdf
    • http://jumbochecker.com/kuzofonobofejixefoxoguymhdj.pdf
    • https://cdn-cms.f-static.net/uploads/4453734/normal_60215456375a4.pdf
    • https://static.s123-cdn-static.com/uploads/4402932/normal_60081b0a32631.pdf
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/fowivuravovuwimo.pdf
    • https://vokefepafox.weebly.com/uploads/1/3/4/3/134333292/nexifazawad.pdf
    • http://leree6.club/97796231065e1edb.pdf
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/xokenifasile-gamezanagafevo-lesulipirog.pdf
    • http://suberubepuparo.getenjoyment.net/48185397398.pdf
    • https://cdn-cms.f-static.net/uploads/4379859/normal_600c11619d7ec.pdf
    • http://kutejovanog.getenjoyment.net/fovuv.pdf
    • http://afracheat9.xyz/tara_brach_radical_acceptance_bookkcj3t.pdf
    • http://lunagogafoxoj.sportsontheweb.net/representation_learning_a_review_and_new_perspectives.pdf
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5ffc289ccd58f.pdf
    • https://cdn.sqhk.co/rawatajizefu/xhf1hf4/nurevoziv.pdf
    • http://wijasagasipode.getenjoyment.net/best_beginner_5x5_program.pdf
    • https://cdn-cms.f-static.net/uploads/4410714/normal_60418111e699d.pdf
    • http://new-volosi.ru/setuvizokujugogejujaxoxavkcpwm.pdf
    • https://cdn.sqhk.co/tudobele/5jijdhg/write_a_formal_email_asking_for_information.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jitawidavez.atwebpages.com/87323520957.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_off0000f1b0.bin
9c3a6bd9a54bd36c6497c8d4667ff431d130800e22d85866afa80b36afa2cd09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 5452 bytes
font_01_sfnt_off00010439.bin
6ef4326a9a55f7fd7aaab0fa203a5343d38d77a9062223decd8d8829daf0538b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 11804 bytes

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