Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f81c2b89b6831e4…

MALICIOUS

PDF

83.5 KB Created: 2021-03-16 02:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05b5514ce9497d4d8d3892ca855579e8 SHA-1: 564bddecdae353d11e72fb8a93e10034a4d4d541 SHA-256: 3f81c2b89b6831e4983a45ddb91e6e0d54ce3275137aea5e68820bd8c782b96f
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, identified as a link farm, directing users to various PDF files hosted on external domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://botokaw.ru/strik?utm_term=las+reglas+b%25C3%25A1sicas+de+uso+de+tilde+en+castellano
    • https://xijuxesipokufi.weebly.com/uploads/1/3/4/0/134042605/c566f2b.pdf
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/b87ea5d.pdf
    • http://job-finder.space/what_language_does_the_mandalorian_speakvqapm.pdf
    • https://puzepoxa.weebly.com/uploads/1/3/4/3/134318678/virozirir.pdf
    • http://nukels.xyz/what_is_the_difference_between_master_quest_and_ocarina_of_timegdw9r.pdf
    • http://trendmobile.ru/youtube_la_la_land_soundtrack_full_album4uikz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dowisakivu.epizy.com/kexexofegena.pdf
    • http://xobiluwova.epizy.com/77917416496.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_c3170bbd2e43432eaa97bec001cfe048.pdf?index=true
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_2426dca81d62416c8a0c03b8efebcebf.pdf?index=true
    • http://gavativu.epizy.com/tipebewutar.pdf
    • https://uploads.strikinglycdn.com/files/23dcd557-f3c1-425e-9d59-0318b7b07edc/dubifanego.pdf
    • http://sogonuvusawi.epizy.com/97046016299.pdf
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_362bd3e798654a06bd2cf2566d80b9bb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f6eee033-ad36-4c3e-a7ab-93706b9c8d95/after_we_collided_australia_release_date.pdf
    • http://wimofulun.rf.gd/15471211207.pdf
    • http://bikikifuxax.epizy.com/hearthstone_arena_guide_witchwood.pdf
    • https://uploads.strikinglycdn.com/files/b4f90813-e044-4494-a938-4acee43b03f3/momedumipegogeranasiri.pdf
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_69f18e61271c4df98b8c6f8167333905.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f4574d9-60d7-494a-b4db-542cf77a9825/13863040551.pdf
    • https://uploads.strikinglycdn.com/files/7529e750-f6ac-4865-8975-8235329e6579/how_to_get_iso_22000_certification.pdf
    • http://saligirij.rf.gd/89261266763.pdf
    • http://sivumokevidosib.rf.gd/end_of_project_evaluation_report_format.pdf
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_88377c7bf0f849fa8a7788bc7d5bd15e.pdf?index=true
    • http://toxisokipefofo.epizy.com/tenofekotivopejowesivud.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc3.bin
37a3f4ec2f30fee43aa967ed1f6b0dca1a8a5a41d6c52edb4fec7d734950f8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 5420 bytes
font_01_sfnt_off0000ffb3.bin
ca06c879e618d9208497ab6c1924ff450428c7ed529f62701e34122ade0c841d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 12520 bytes
font_02_sfnt_off00012823.bin
bfae0373e6f06d67c55370e9c364ea249478a919f7f7a9ac2cbea48dfd201eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 16120 bytes

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