Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93622ec3111420b…

MALICIOUS

PDF

44.6 KB Created: 2020-11-07 05:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2ab659cdca7b30bace25e6dab74d0618 SHA-1: 78699e1df078710c8a5db789bf174b5cddd8877a SHA-256: e93622ec3111420b9dd11feed14e9dd33fdc8adaa305ae34a5ebe04e23b3940a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its harmful intent. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffnew.ru/aws?keyword=20th+anniversary+stone+color PDF link annotation
    • https://xodunutejoxefis.weebly.com/uploads/1/3/4/4/134476009/nefim-rejamep-wolidilip-motitilag.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/wikusapa.pdfIn PDF document text
    • https://dumitekajeru.weebly.com/uploads/1/3/0/7/130740207/tusejiloxumi_duxelagek_tevikemi.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/nanorotulexinino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f892f847628f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_5fa5e1e9c1d76.pdfIn PDF document text
    • https://videxopefofima.weebly.com/uploads/1/3/4/1/134131768/c6d5c59cf.pdfIn PDF document text
    • https://wokesije.weebly.com/uploads/1/3/4/5/134597961/tetegebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_5f9aac8549071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5f957ca46a5ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5fa603b2a7548.pdfIn PDF document text
    • https://vapufubewadul.weebly.com/uploads/1/3/4/4/134485241/f99ad25fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f8e2707e8457.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/kijelopazekune/longman_academic_writing_series_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c305cc06-cc6f-47d5-b6de-50f780f35129/rf_power_amplifiers.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/graphs_and_tables_templates.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70AD 5228 bytes
SHA-256: cd2b38cc9705c23d5ce980f8273cc8e0c267ceeb91324810cf0b7a50a3adabe9
font_01_sfnt_off00008274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8274 10344 bytes
SHA-256: 29eb950eebc5d05bfd03b4da9d75f284f9b7122b3d6d35e46f13b488e39007ee

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