Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef08ad6a1215cd1e…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 17:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c765f04667c37af257bb85626bfce627 SHA-1: 7f5c02651c484f4826da7ae17d1160520b685c41 SHA-256: ef08ad6a1215cd1e197fbe2b37dd201e571722061e6e7325499c039934f1d628
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to benign or unknown sites, but one prominent link points to a suspicious domain ('resalured.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to downloading game content, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=how+to+download+rock+band+4+songs+ps4
    • https://cdn-cms.f-static.net/uploads/4489976/normal_60460fa0a31ec.pdf
    • https://cdn.sqhk.co/popaxutu/4rji7ij/71564254771.pdf
    • https://cdn-cms.f-static.net/uploads/4383804/normal_6044fe88c446d.pdf
    • https://cdn-cms.f-static.net/uploads/4418013/normal_600d6abd98658.pdf
    • https://cdn.sqhk.co/kufalavoxig/1CDuh4F/rexoza.pdf
    • http://netewe5.xyz/89378135353dha3b.pdf
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5fd27cd811af6.pdf
    • http://startbastar.online/tabla_de_conversion_de_fracciones_de_pulgadas_a_centimetrosh6ehx.pdf
    • https://cdn-cms.f-static.net/uploads/4446942/normal_6040d87ba0326.pdf
    • http://clientbluebadge.com/how_many_calories_in_an_iced_chai_lattepiqqx.pdf
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5fe4765107587.pdf
    • https://cdn.sqhk.co/tirabipati/ggjgjg2/top_20_free_kick_takers_fifa_21.pdf
    • http://kexedeziferu.sportsontheweb.net/differential_equations_and_linear_algebra_3rd_edition.pdf
    • http://shtangye.xyz/madeline_book_seto1ej7.pdf
    • https://cdn-cms.f-static.net/uploads/4451212/normal_5fe78e6da608b.pdf
    • http://drenajkrasnodar.ru/sufidowepaxisvdq04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_4b30643d2bf5427aac02b1fc183d9854.pdf?index=true
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_7019ec3b3b0345e9814ea81b16af826e.pdf?index=true
    • http://lugenizuridaj.atwebpages.com/25191555836.pdf
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_8fc59f6b634d4289a3bdb7fdad4983d2.pdf?index=true
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_857ec3c94fdf44bfb3c66abef11de7c4.pdf?index=true
    • 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_off0000f020.bin
13dd7572b897d28a68050c2f37ea9ac32d587bbc07ca9f8e22c0df0b6ab44e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 5588 bytes
font_01_sfnt_off00010346.bin
e3f8512efe80a54a0b2790ef4293a150b88dcde20d4af16f5780b84a1d1b5fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 11732 bytes

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