Malicious PDF — malware analysis report

Static analysis result for SHA-256 748dc4c6a6baa562…

MALICIOUS

PDF

77.9 KB Created: 2021-02-23 18:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0d48912d45371b5692db86285a5450b3 SHA-1: 9f179374f14c0ae48e0aead4da50e202b4c81316 SHA-256: 748dc4c6a6baa562d5bf5a7df1bf2e65a3743aa2f12792083e73637aa82f750c
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://jottigo.ru/123?utm_term=origami+crane+instructions+wikihow PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445736/normal_60021aa5e863b.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/fnAieih/best_pin_lock_app_for_android.pdfIn PDF document text
    • https://peramixirado.weebly.com/uploads/1/3/1/6/131637131/4364220.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/jcSH8qo/81125531405.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/nisowolop-genegulur.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/idNFssM/88583634263.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/ggfjhYn/investor_s_business_daily_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/jadja1n/56637448486.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/hagiZ0e/23209461172.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/ShbuNch/spectacle_island_fallout_4.pdfIn PDF document text
    • https://negofajosodin.weebly.com/uploads/1/3/5/3/135314147/dalafefu_xunumopevadoweb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_603281169c3cb.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/gihjd7G/zakowogilagugo.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/b52515b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448995/normal_5fe3fe91c1c25.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/jclfgiE/2020_land_rover_defender_interior_review.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/posufij/ansi_c_programming_language_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/20974889180.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/lorina_speciality_change_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/bheja_fry_2_full_movie_free.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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 5364 bytes
SHA-256: 4b8bc7e90207b61f88d9bba01c9ff67f8105ff5b9a3b5e336eae473cd4d78a30
font_01_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 10460 bytes
SHA-256: 7cfc975a35461e30a741e48e776cb600ec1d1fc72f7ba37d8f9734d32d82c1a1

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