Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbc9f3a4e7149a0…

MALICIOUS

PDF

110.9 KB Created: 2021-03-06 18:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ccbc31eef9f8ef681cbc312ee56b2e16 SHA-1: 39e66bf502b5dbd92184d782d5567506503798d6 SHA-256: 3cbc9f3a4e7149a073fc6ab701736ce417c0d5f38b7363e61073b20bd5a74818
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating it is part of a link farm designed to drive traffic to various websites. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest a phishing or SEO manipulation scheme. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=is+tanzania+a+visa+free+country+to+nigeria PDF link annotation
    • https://cdn.sqhk.co/tizuvuwo/jRPHHjj/buzz_cut_haircut_black_man.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/8aUggZg/ludovico_einaudi_experience_sheet_music.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/6c8355051f.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/2hd7emS/z_nation_season_6_release_date_on_netflix.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/pixelapusanikobol.pdfIn PDF document text
    • https://wafitaweligu.weebly.com/uploads/1/3/4/5/134587259/3031662.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/fmjdDgj/bike_mayhem_mountain_racing_apk_softonic.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/ggG1Rjg/all_star_abs_cbn_basketball_2019_full_game.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/PDgghjO/5367727982.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/BnhU6ib/little_misfortune_demo.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/Ivjatia/stickman_and_gun2_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/ig9zhgl/harvest_moon_album_neil_young_lyrics.pdfIn PDF document text
    • https://mixasokuxorizu.weebly.com/uploads/1/3/4/7/134742222/d542f34f88fa.pdfIn PDF document text
    • https://pakefipeve.weebly.com/uploads/1/3/4/0/134017053/gifalesibuba.pdfIn PDF document text
    • https://wusaworapivuwor.weebly.com/uploads/1/3/4/6/134659128/ab43b1853f6e3.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/iGhhjbo/50768777000.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/haEhfic/guwadinemaga.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/e1njche/mountain_bikes_for_sale_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/hifhdgf/buzz_lightyear_costume_adult.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_b740bf2bb88f4933a42640db7ac23f25.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_de84d114a4e24c4ba63c8499609079cf.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B84 6324 bytes
SHA-256: f0f35ef415c3dea597756807549bfc62dd5247577a13836bea8681c56a29c902
font_01_sfnt_off000160d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D4 5048 bytes
SHA-256: 0950d1ac53fcb39203658aa6a240e64031618a4c7f863147578dceb0ff2de80d
font_02_sfnt_off0001721c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721C 15264 bytes
SHA-256: 6814f0b66079a4f37ac4ad4ce82c3966cbe6effb3478ae5aeef98bbd5a070455
font_03_sfnt_off00019f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F7F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3