Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e53551e3891a554…

MALICIOUS

PDF

72.5 KB Created: 2021-03-09 00:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b61b4c4077f8b41424be2c43d25578ac SHA-1: bd3cf1ca9bc4e88460a109df85e1f1bbba190e19 SHA-256: 4e53551e3891a554ae4e9792f695be4562bdc13d585a6b4e76b53f987446766c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, suggesting a link farm or phishing attempt. The embedded URLs and the PDF structure indicate an attempt to redirect users to malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/123?utm_term=batman+2+tamil+dubbed+hd+movie
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/4cf768e880f8a.pdf
    • https://cdn-cms.f-static.net/uploads/4480744/normal_601de69557565.pdf
    • https://cdn.sqhk.co/wobuwaseja/ijcheSk/titan_quest_atlantis_builds.pdf
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/92e279a64.pdf
    • https://cdn.sqhk.co/litawoxelida/qPhejjQ/pirate_ship_fighting_game.pdf
    • http://pagexanomala.22web.org/jean_gaboriau_guide.pdf
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/2b988284ea63e5.pdf
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5fca4617436ce.pdf
    • http://mixumawetogufik.22web.org/ninobularatijaxabeg.pdf
    • https://cdn-cms.f-static.net/uploads/4476582/normal_60206f0b99323.pdf
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/liweroneloz.pdf
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/rexitaginiso.pdf
    • https://lilexoben.weebly.com/uploads/1/3/5/3/135331811/56bf0468c83969b.pdf
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/simetakadaladox.pdf
    • https://sazulolako.weebly.com/uploads/1/3/1/4/131453808/5022744.pdf
    • https://xafijaxipumin.weebly.com/uploads/1/3/5/9/135966545/fupevufubedogo.pdf
    • https://cdn-cms.f-static.net/uploads/4415077/normal_6035f7eda8dc4.pdf
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5ff1b24e38f52.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/c1f24403-b192-4c7f-a8ae-b0d3ab41230a/brother_mfc-j825dw_printing_blank_pages.pdf
    • http://vulajasazibu.epizy.com/zedafizafebikorakot.pdf
    • https://uploads.strikinglycdn.com/files/98730baa-4d13-4ae7-9d61-41733aab8ef6/why_is_lennie_lonely_quotes.pdf
    • https://uploads.strikinglycdn.com/files/346b8cb7-04f2-49d4-8ca4-589bfb54b58a/how_to_get_the_judge_feature_in_pokemon_sword_and_shield.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d116.bin
b378f29e0f92a74729ba8ebb252f59f42b2c665fdfda284d33d0057ea37d8baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD116 5172 bytes
font_01_sfnt_off0000e28c.bin
c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 2656 bytes
font_02_sfnt_off0000ed94.bin
dda091062533ccd7b69d5988488536634504bf4d956feb36263451179cc5b303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 11852 bytes

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