Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35e5f8c16e0dd45…

MALICIOUS

PDF

76.5 KB Created: 2020-11-11 22:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 67a006a7dafebea67f5f052fb77569cb SHA-1: 9d6f2ed09c04ccf04333ad03980d14ac10de48c4 SHA-256: c35e5f8c16e0dd4571023fa2296441be6480a583f12b60abff56c3661d95ecb7
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=lortone+tumbler+parts PDF link annotation
    • https://poxusesemeli.weebly.com/uploads/1/3/4/4/134462398/raxavavafalorutosa.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/vulipatal.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/7138079.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/99edb22468a5e.pdfIn PDF document text
    • https://tofejigijo.weebly.com/uploads/1/3/4/3/134312142/346598.pdfIn PDF document text
    • https://mavepokakep.weebly.com/uploads/1/3/4/6/134628520/zufonugunam_boxaw_lodopurabezir_wuzadoguxabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fa2adffc8e4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5fa1ab7dd92c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459794/normal_5fa38de9c68c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5f915fa833589.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/8192911.pdfIn PDF document text
    • http://www.opentle.orgIn 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/65f4dc56-d314-4d85-b229-b24c729100e4/bizuvuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d62f163-c9e3-4bc0-ad9a-58e0fa9e7548/79266899460.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000dc06.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDC06 12456 bytes
SHA-256: 644aa23c089338d6d2c8d367df61fbd6901e891e8dad88da6d4799fbea48c490
font_00_sfnt_off0000cb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 5044 bytes
SHA-256: b412953b2d03e8a1aa3f72dd70fe6f335815df81347bcd4329eb350ae9e24190
font_02_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 11092 bytes
SHA-256: 020079d02682d9edae66d90869e0685eebc9b36fe6378c8f538a09f8167422b9

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