Malicious PDF — malware analysis report

Static analysis result for SHA-256 56669112db9a67ef…

MALICIOUS

PDF

90.8 KB Created: 2021-03-22 00:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eb962994b54b1ef6cd2b70b44321008 SHA-1: 5ce50a0dbb37b76326b334b1305c15ec0a2657d3 SHA-256: 56669112db9a67ef7fe07d6230051a1e19ab3d4f894e8c36e0b2e257f08c1eaf
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of links pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically flagging it as phishing or a trojan. The embedded URLs, such as 'https://seumenha.ru/award?keyword=practical+java+8+lambdas+streams+and+new+resources+pdf', are used to disguise the malicious nature of the document.

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://seumenha.ru/award?keyword=practical+java+8+lambdas+streams+and+new+resources+pdf
    • http://xaraxag.mypressonline.com/61220774185.pdf
    • http://tiluvopira.medianewsonline.com/wejemosamivovonefiveniti.pdf
    • https://static.s123-cdn-static.com/uploads/4421612/normal_5fe176ab4bb18.pdf
    • https://dukikabapesudux.weebly.com/uploads/1/3/4/1/134108868/6893778.pdf
    • https://cdn.sqhk.co/kimazibo/gfhajfu/razas_de_perros_pequenos_y_peludos_en_mexico.pdf
    • https://cdn.sqhk.co/niririga/hije8qP/najomimajix.pdf
    • https://cdn-cms.f-static.net/uploads/4503279/normal_5fd62dcc21115.pdf
    • https://cdn.sqhk.co/bexuxoxabim/Pggjgfr/hero_xtreme_200r_image.pdf
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/2213648.pdf
    • https://cdn-cms.f-static.net/uploads/4482872/normal_602bb184ef730.pdf
    • http://torixobo.mypressonline.com/51573874028.pdf
    • https://cdn.sqhk.co/wexifidobafo/jghibDC/t_mobile_prepaid_plans_2_lines.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2639413-a17f-40aa-a09c-33b0f71d9b57/boy_scouts_of_america_abuse_lawsuit.pdf
    • https://s3.amazonaws.com/sefabe/soft_white_led_c9_christmas_lights.pdf
    • https://s3.amazonaws.com/dudujopixejikug/how_long_to_get_an_enhanced_driver_license_ny.pdf
    • https://uploads.strikinglycdn.com/files/1a6fb50d-a213-43e4-a8d2-f4cacdedf1b9/18727378246.pdf
    • https://s3.amazonaws.com/kodipopujufipig/how_to_load_a_swingline_heavy_duty_stapler.pdf
    • https://s3.amazonaws.com/mexijegedakol/android_cardview_dependency.pdf
    • https://s3.amazonaws.com/domegagowevag/50463465299.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_off0001224c.bin
e95008805773c745bda420151ae44b636cef3cd032b31630fbc06a26e667efaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 5864 bytes
font_01_sfnt_off0001363f.bin
70729401f5e6e9945c7673fde8d4005793da110e0dc6db6ac755d6762121a80a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1363F 11596 bytes

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