Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b360c9a8fe5b9b…

MALICIOUS

PDF

66.0 KB Created: 2020-11-20 01:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1942db39b1ad9471167ec1b3c688405e SHA-1: d3011c62fb25aa396eb17ca0bfa63ecdd4451b46 SHA-256: f3b360c9a8fe5b9b4e1dd5175faf75c1231291eac0864b35581683baf2a4d1df
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=weider+8630+manual+espa%25C3%25B1ol In PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/xezulenokopege-bosujaxizuj.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/9ccc44.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/nosaf.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/zilariteliwijokotisi.pdfIn PDF document text
    • https://kadefetu.weebly.com/uploads/1/3/4/4/134471860/40e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f86f4c2beb8a.pdfIn PDF document text
    • https://jikesekija.weebly.com/uploads/1/3/4/3/134367489/8461522.pdfIn PDF document text
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/3573591.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/2275184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fa6e2ed38cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_5f9c979a9950c.pdfIn PDF document text
    • https://biwiporiv.weebly.com/uploads/1/3/4/6/134620494/4445549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5f9b62aa3b367.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://uploads.strikinglycdn.com/files/5d5d7a32-1924-4ddd-8fb0-6b91407535f5/bigivelewuneju.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/the_sudan_iv_tests_for_which_substance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99b498f-1536-4628-81a7-53f17cbafaf5/how_to_print_invoices_in_quickbooks_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C1 5788 bytes
SHA-256: 44150784acd298902bbdd2b6ff76684e044ab2e7a6d401955cb0e245bde8dca2
font_01_sfnt_off0000c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 10012 bytes
SHA-256: ce9f5b352b82c9d727505dde8e30a6172872e7b2d1fff13216b229dc8932d8a1
font_02_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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