Malicious PDF — malware analysis report

Static analysis result for SHA-256 b378c08fd41b1efb…

MALICIOUS

PDF

81.8 KB Created: 2021-04-28 18:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 721e9b11699af82396f3da6613a4c044 SHA-1: 46f57c4049c122ff3e7f498aab3a2583d84b0693 SHA-256: b378c08fd41b1efb5f565249dd516c4d751529a799ad9e81e91c41535f0cf38d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to direct users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious content, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://xezojetit.ru/strik?utm_term=how+much+should+a+ccna+make
    • https://cdn.sqhk.co/rebamomidaw/jjgfhbg/souq._com_fz_llc_dubai.pdf
    • http://digitalliteracyinstitute.com/leatherworking_classic_guideftjof.pdf
    • https://cdn.sqhk.co/feletitami/fEWToEu/xinarumeme.pdf
    • https://nakubinigana.weebly.com/uploads/1/3/1/3/131379761/b5e3748.pdf
    • http://help-bluebadgecenter.com/zombie_apocalypse_escape_room_orlandov0cvv.pdf
    • http://usacreditmonitoring.info/nulusazumanujekitefutcs5.pdf
    • https://cdn.sqhk.co/fetesulatol/gVhdhjW/27372533091.pdf
    • http://keto-s1.com/korelafo2cja.pdf
    • http://douchelabs.xyz/engineering_guide_vanilla_wowheadu5m5o.pdf
    • https://guwemegarorara.weebly.com/uploads/1/3/4/3/134353603/7020117.pdf
    • https://mawajajapok.weebly.com/uploads/1/3/4/3/134353668/3450637.pdf
    • https://cdn.sqhk.co/zudoputasafe/7gehbcn/movie_creator_software_for_pc.pdf
    • https://cdn.sqhk.co/nuzinipaz/hchiJVY/defender_110_x_price.pdf
    • https://cdn.sqhk.co/fonazovep/Eugd35h/kogeleri.pdf
    • http://daddytestit.xyz/51371806828t2tub.pdf
    • https://cdn.sqhk.co/zijigemeworu/ifjcif4/jasoboleninekijokos.pdf
    • http://blancop.xyz/piruwuw6edq9.pdf
    • https://cdn.sqhk.co/sogunixe/ifvozgj/marketplace_cars_for_sale_near_me.pdf
    • https://cdn.sqhk.co/bepesewutu/ehcpeET/temple_run_2_download_apk_uptodown.pdf
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/vanotagi.pdf
    • http://salea.site/49810915329oegos.pdf
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/a77653609.pdf
    • http://tk-pobeda.site/saber_que_tipo_de_archivo_es_linux55qvb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ec0987f6-0c84-40ae-8cee-2c1ede3d612a/echo_cs-400_chain.pdf
    • https://uploads.strikinglycdn.com/files/8db12e47-aa33-4836-81cc-c2d6f7fcd1cb/intermatic_pool_timer_programming.pdf
    • https://uploads.strikinglycdn.com/files/83695e13-2d6f-4fdc-8599-d562db70f5bb/what_is_the_purpose_of_technical_writing.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_off0000f326.bin
f8488eb14217bfa4e1b9f2814e8a3a4f3eeaae18549006391096b4fcc15009b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 4956 bytes
font_01_sfnt_off000103e1.bin
9a437d6fb3bd322d72d2787d6432224fc7ce8e66e9eea31de5b2b21e28a8aa75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 11488 bytes
font_02_sfnt_off00012b2b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 4324 bytes

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