Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dc95c82753eac0…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 23:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2ca22de0593b7f52cbb3623107967588 SHA-1: 8f877afa69af0465fac3615c32712afcbbb735da SHA-256: 57dc95c82753eac0b533b0658f1a85bd86e48d1688208f9d5cbb34c87b48891f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=alkaline+diet+recipes+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5ff532f9d05af.pdfIn PDF document text
    • http://cuzinfo.ru/wikojot1asb.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/sharp_aquos_lc60le640u_manual.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/00ad8f4da1599b.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/binomial_theorem_expansion_worksheet.pdfIn PDF document text
    • http://omshop.space/dragon_ball_z_battle_of_gods_english_dub_online2b55n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388421/normal_5fc7466a538b3.pdfIn PDF document text
    • https://nomiviweran.weebly.com/uploads/1/3/1/0/131070579/jadowolig-weridijifol-mujuxolot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_603727db627dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475875/normal_5fc944b7cebab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5fdf1240ae168.pdfIn PDF document text
    • https://tupobufilu.weebly.com/uploads/1/3/5/3/135310482/juvujebugu_noliz.pdfIn PDF document text
    • http://monoga.space/a_composio_gentica_de_um_indivduo_recebe_a_denominao_de9klce.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/4903833.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_9412c54d88794d8daac7bc517bf3c082.pdf?index=trueIn PDF document text
    • http://timerojulawu.myartsonline.com/ernie_ball_volume_pedal_jr_25k.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_197249cc162e46d09b905a41a5e8352d.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_4965666ceeb24612995901248a8a9ef3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/megofejuwebenudeforop.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/2004_chevy_malibu_service_manual_free_download.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 5260 bytes
SHA-256: 59104fe8b0130cb2c36d5441609d307c5eca7d43318c067d86f48dd96bf4f18d
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10708 bytes
SHA-256: 4fc1966cb428c264e06205d0cefb8a1d25fd29d4f498acf7c14752ea56569c44

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