Malicious PDF — malware analysis report

Static analysis result for SHA-256 a567fe096c2dfd47…

MALICIOUS

PDF

97.6 KB Created: 2021-04-27 21:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a57ca69950f40c4c3bff49eaf731429 SHA-1: ea47ed991ea045655c61ee2064480515c47b9e78 SHA-256: a567fe096c2dfd4713f8119c270bf2bf996903618718692b8f1754fbf34730ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule indicating a large number of external links, and a ML classifier identifying it as malicious. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of numerous external URLs, some with unknown reputations, suggests an attempt to redirect users to potentially harmful content, aligning with phishing or SEO-based malicious schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kuzutuzo.ru/strik?utm_term=monsters+vs+aliens+tv+show+wiki
    • https://cdn.sqhk.co/pirujezexod/fJPThc3/banadu.pdf
    • http://ryursew.space/aristotle_the_art_of_rhetoric8w9p3.pdf
    • https://cdn.sqhk.co/gamakokub/ibkgjeC/creepypasta_splendorman_x_reader_lemon.pdf
    • https://cdn.sqhk.co/fivufotimad/thchjf7/pigsback_hotel_deals_killarney.pdf
    • http://hookup157.site/boomboxx_i_dey_instrumentalov69z.pdf
    • https://cdn.sqhk.co/tokebamojos/yjgPhdK/97984929822.pdf
    • https://cdn.sqhk.co/fimegasaz/WTdhiB8/43410183718.pdf
    • http://rowitewufow.22web.org/25555118984.pdf
    • http://salonvarna.com/nevumolopuzisukesikime8v128.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tubujaj.epizy.com/chaganti_koteswara_rao_ramayanam_free.pdf
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_73441d02fcce4914be2453fb35b58b8f.pdf?index=true
    • https://s3.amazonaws.com/juzewojavomofew/tusirebuwenivudazodo.pdf
    • https://s3.amazonaws.com/sojaxub/carbon_black_company_information.pdf
    • https://s3.amazonaws.com/bulikowexunepov/calories_in_chick_fil_a_grilled_chicken_nuggets_12_count.pdf
    • https://s3.amazonaws.com/libusamagowuvo/wd_my_cloud_ex2_ultra_set_up.pdf
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_aaebd2db01a049eb8f7c80f5afc3acd0.pdf?index=true
    • https://s3.amazonaws.com/zumezeviwakiz/gutesovozef.pdf
    • https://s3.amazonaws.com/xufujofaleki/nikurugukuroj.pdf
    • https://s3.amazonaws.com/jasipefulaxiduj/big_green_egg_extra_large_nest_bbq.pdf
    • https://s3.amazonaws.com/xakusineba/2006_honda_civic_hybrid_battery_life_expectancy.pdf
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_a1b6ce514928417a8456532695b3b201.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_474ac90529ed44088d5d7278a0e61244.pdf?index=true
    • http://mapexas.epizy.com/lambda_layers_performance.pdf
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_9c51299909034b2883c584967afa70a2.pdf?index=true
    • https://s3.amazonaws.com/wozoxub/which_country_has_the_most_aids.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_off00013296.bin
748d46c5ca3adf3f0840f8d4b12efd89879f18e6f83ae428887f9613c9107aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 4784 bytes
font_01_sfnt_off000142db.bin
fa4ead7314e378ba76270f7116020891fed378b2298f06c7bbb46cbd67f70b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142DB 11728 bytes
font_02_sfnt_off00016a82.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A82 4324 bytes

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