Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dac25ce9117457…

MALICIOUS

PDF

77.3 KB Created: 2021-05-10 23:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ae9b0f518ea0b7f5fc30b2c7e4f15477 SHA-1: bab53304e5504be9fdd3913f57a925804b9e250b SHA-256: b6dac25ce9117457f5ffa24edaf5ba0516005089ebc99197e7636aca2fdfd697
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a link farm with numerous external PDF links, suggesting a tactic to manipulate search engine results or distribute further malicious content. The primary malicious URL identified is pelibifir.ru, which likely serves as a redirector or landing page for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=what+word+best+describes+central+america%2527s+climate PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365656/normal_5fe3f24154f2d.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/nhfUjgW/59958370905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_6069c44c2f827.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/OgCEgiB/edudel_date_sheet_2019_class_6.pdfIn PDF document text
    • http://genusttwsr.fun/camus_the_myth_of_sisyphusxj4ep.pdfIn PDF document text
    • http://itchia.space/bluest_eyes_in_texas_nina_persson_chordsslnre.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/5Xhd0Pf/72243365481.pdfIn PDF document text
    • http://rusherx.studio/coolorus_2.5.11_crack8zoqp.pdfIn PDF document text
    • http://canonsburglake.org/kohler_lifetime_warranty_phone_numberqtn1g.pdfIn PDF document text
    • http://pss77.ru/how_do_you_express_feelings6an1k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/094134a9-5e29-463c-8a63-2642b5a7933a/sims_3_download_mods_folder.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_85cb8a0b19ed45d0b7a68ecadb318218.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_864e00c602244490940348391224cbc9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f5bdd2-4bdb-498c-82a3-c27a3addc5ea/sig_p229_legion_review_hickok45.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0db7d7-d5b0-468e-94f2-552e586f2c5d/xorojotutim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196e4546-fb90-49b4-9de8-3fc6bd5997a3/sipojenu.pdfIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_74c58ba0a7794925b5ea86a95bf9565d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92eb8664-564d-4835-bd87-0c76658e762b/star_fleet_technical_manual_1975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a00c26-09d7-4b55-9672-8341f27825b2/como_llenar_una_carta_poder.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_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 5456 bytes
SHA-256: fe274c2da2fa6caa8f1aa989edc108bbd99a7989739b4b4171d07fe0112f1e0d
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10864 bytes
SHA-256: b6d41810e7813d85209f92535b05cde1fb0fad5fce73060a675dacdca382b6a8

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