Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcf46c06d8bc88b…

MALICIOUS

PDF

79.4 KB Created: 2020-11-25 23:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0ace8e9c3f0f3d857070e4805709fa25 SHA-1: 2de324e078589375b439df99252c7e0ede4ea019 SHA-256: adcf46c06d8bc88b6ba8c1ec79153ccb04e47f89c5b776829f95e8aadc5c677c
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://traffking.ru/123?utm_term=acceleration+problems+worksheet+and+answers PDF link annotation
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/zifiwimin.pdfIn PDF document text
    • https://ferirakiwuku.weebly.com/uploads/1/3/4/8/134899479/buwanikopowamo_fuxosubifule_garutatatavu_fikilomuwula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5fae7eb7479f8.pdfIn PDF document text
    • https://vozopameniv.weebly.com/uploads/1/3/4/5/134593493/9974852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f912335cff6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5fa6bb884cad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5fa395865a519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_5fa376c97b03b.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/nixitegilamije.pdfIn PDF document text
    • https://duzufekiwavana.weebly.com/uploads/1/3/4/6/134609718/7227797.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/1079206.pdfIn PDF document text
    • https://jutabuja.weebly.com/uploads/1/3/4/6/134666284/molud_dejupe_fineno.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/nazokisozumigovaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5f9e43e41b9f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_5fac10c9efa7f.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/e97020a7-023a-4e22-a74f-13371f2ba08b/rachel_waller_md_richmond_va.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_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 5600 bytes
SHA-256: e8729cfbb75d76e88eaca5ac27421742e6b5bb829cea9fc6c57e2fb875c3a10a
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 15120 bytes
SHA-256: f600f2fb05420863b38cb6215083a5165d62be2531e23db293895f70c6130c4b

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