Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a56fb343b2b36c9…

MALICIOUS

PDF

71.7 KB Created: 2021-03-14 07:27:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 868fff60d08e171bcd683e11f39a7453 SHA-1: 836f39852d75d62415d554a8e0d3299733e92fef SHA-256: 4a56fb343b2b36c93655c6b10ac45cd712659ea639a4350c9b18392e4ef39c4e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with one prominent URL suggesting a lure related to wedding bomboniere tags. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting further support a malicious intent, likely to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=wedding+bomboniere+tag+template PDF link annotation
    • http://rowexusaje.mypressonline.com/mathematics_books_for_class_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_6016cd03305d3.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/eghigvG/the_lobby_elizabeth_nj_facebook.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/define_budgeting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_602c97318a8dc.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/59619168219.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462354/normal_5ffeec8571f2b.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/jfghgdP/guess_the_actors_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/pomodizad/jaQq9rC/high_gloss_laminate_sheets_uk.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/68788516051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_6004b196b5c72.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/sql_tutorial_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406776/normal_5ffec1d2373f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_e64e4515a0dd493795f56740da81c4e4.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_30fafb6c1ff5449d9343c046c34d5d0b.pdf?index=trueIn PDF document text
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_ba240bb4dcb2440a865ab30b43247e9a.pdf?index=trueIn PDF document text
    • http://xogijowag.onlinewebshop.net/10771305568.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_7793f358e4fd47c3972d6029e799b2d5.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_0c860279af6f4f1fb4b231f360a17280.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_6c52771230994dd694c9e110ade50fe3.pdf?index=trueIn PDF document text
    • http://fowimifefezujo.myartsonline.com/2006_bmw_330i_starter_problems.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_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 5256 bytes
SHA-256: a79ef54859182faa6c383e6b97c63901312e93c5194d7bcc0d428979ac08d9ff
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 10384 bytes
SHA-256: 62b5ac266990ae19513e285c323054dcb62a47d63bb49595ffb46c6f6db62745

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