Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fd53d3a3085d5b…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 12:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecb9947a7539f4696e74a539c614f738 SHA-1: 2adab4b4ae6679074e891a63e0542237dcbd2c37 SHA-256: 48fd53d3a3085d5ba2d96d1eed5b991ec7bee4ebc762382248c417e155029100
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites.

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://dafemum.ru/wix?keyword=seloc+manual+1301
    • http://student-yurist.ru/flir_c2_manualofrhf.pdf
    • http://allroadkamchatka.ru/pimumepabuserfu15p.pdf
    • https://static.s123-cdn-static.com/uploads/4480755/normal_5fff485ab7a63.pdf
    • http://jiwabozaxexe.mypressonline.com/i_am_a_child_of_god_song_chris_tomlin.pdf
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/lagogiv.pdf
    • https://vafumavuforowa.weebly.com/uploads/1/3/4/4/134489815/1236289.pdf
    • http://fimewovoko.getenjoyment.net/adsorption_chemistry.pdf
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/lirixizigu_junenevob_wikebelofefix_xamen.pdf
    • https://cdn-cms.f-static.net/uploads/4462993/normal_5fd3abdf6c83b.pdf
    • https://cdn-cms.f-static.net/uploads/4479715/normal_6031d653edde4.pdf
    • http://gatofupimekow.mywebcommunity.org/10th_class_maths_solution_fbise.pdf
    • http://govakokes.22web.org/vanafa.pdf
    • https://cdn-cms.f-static.net/uploads/4392877/normal_60498c793ef47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nekaxogide.epizy.com/the_lost_love_letters_of_heloise_and_abelard.pdf
    • http://wuvadik.rf.gd/92488926153.pdf
    • http://zawemitop.epizy.com/bootstrap_templates_html5_free.pdf
    • http://nonosolagosev.epizy.com/60717326664.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_off0000ec61.bin
53d5618c0bcdef89222ae619b4d4fe66952bc9b3af21f36d80c918729a4d4601		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5132 bytes
font_01_sfnt_off0000fdcb.bin
741aa5d08f1ceeabee7e762b4115ea9f7d27f4c26c2a6666ae24e5aa73a91d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 15776 bytes

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