Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62455cab4841a44…

MALICIOUS

PDF

67.7 KB Created: 2020-11-18 07:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3e1c860a413bb83a410dea9609f668e7 SHA-1: 22a8753120c11ba029b9dcd657c9bcc7fb34d236 SHA-256: a62455cab4841a4475b0cf6fa01fbe45c2942cdbfdbcd43a1bbb8743bf5dc3a0
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 0.9998

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://trafficel.ru/strik?utm_term=Ford+ranger+diferenci%25C3%25A1ln%25C3%25AD+p%25C5%2599evodov%25C3%25BD PDF link annotation
    • https://faxufoxexukixel.weebly.com/uploads/1/3/4/4/134455740/cc947d7bdc612d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480889/normal_5fa9350787820.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/f817b7b482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f86f4cca4cb4.pdfIn PDF document text
    • https://ponusowugam.weebly.com/uploads/1/3/4/4/134438000/xikitunorakigogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8756f546496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5faf77190c953.pdfIn PDF document text
    • https://turetajonu.weebly.com/uploads/1/3/4/6/134629909/bapolot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5f90e5849f448.pdfIn PDF document text
    • https://zofomuwane.weebly.com/uploads/1/3/4/0/134040850/4766669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5f8e686d58d74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5f9dad46e6a46.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/ham_radio_band_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/waxejajinigafu/73088214530.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/jisirojuneneju.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_off0000c69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69D 5696 bytes
SHA-256: 7aa6f9325dccfd33a30fa14b14915215d2607e79804971df21ca23f2cc9cecdb
font_01_sfnt_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 12244 bytes
SHA-256: 5aa8543a8dcd8a766cee1c06448de13e939c42421cc455dfdba347501df040e9

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