Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c09878b9680a4cc…

MALICIOUS

PDF

74.1 KB Created: 2021-02-15 23:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 63f81768b6554e6e46523625522a300f SHA-1: 5974e2586d2d41529c6f025f5b3003812ab441c2 SHA-256: 8c09878b9680a4cc9559a1870d78b7e012d880ee6ca542afcdc1f390f33c646d
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were directly extracted, the presence of many external links implies an intent to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/123?utm_term=trop+prefix+meaning+biology PDF link annotation
    • http://xowozumevabig.66ghz.com/address_format_letter_usa.pdfIn PDF document text
    • http://wexoxunesixu.iblogger.org/najivulov.pdfIn PDF document text
    • http://ig-about.net/48080401156qbvho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_5fd7d8642b430.pdfIn PDF document text
    • http://greyfruit.space/avoir_verb_forms_in_frenchdjdme.pdfIn PDF document text
    • http://natorg.fun/450740086410o42i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_5fe747cab87fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444869/normal_5ffce4785e799.pdfIn PDF document text
    • http://fbcopyright-center.com/dokarobejoljtpm.pdfIn PDF document text
    • http://hytri.com/linear_equation_function_table_worksheetos5s3.pdfIn PDF document text
    • http://dixunawizodel.iblogger.org/fifty_shades_freed_music_lyrics.pdfIn PDF document text
    • http://evatopshop.xyz/chase_sapphire_benefitsvng7v.pdfIn PDF document text
    • http://wavasesinile.22web.org/fruit_of_the_loom_underwear_size_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_6021f9b9e11d7.pdfIn PDF document text
    • http://newberginvestmentproperty.com/23812604724e3szb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nototen.epizy.com/angle_finder_camera_app_android.pdfIn PDF document text
    • http://wabipoxagapez.rf.gd/karuppasamy_audio_songs_masstamilan.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_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 5304 bytes
SHA-256: 44c20f7b09c7e2d99fc699d6e2c285f419afe718d7b152e333fcd4f442827d15
font_01_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 13764 bytes
SHA-256: 9d7075b18dc5e15ee52f700e58155f75a4177290b62bea45bc0a714b7c9f99cb

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