Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ece996117acd1e…

MALICIOUS

PDF

86.7 KB Created: 2021-03-01 10:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 615eedba67fdf09880c7f16eb727fb45 SHA-1: ea6480215af44b5ad41bc474e9367edc2fdb7abd SHA-256: 41ece996117acd1e47c25e7f8793603f9f02e57e556e50f98c94cebc85e0249a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to technical issues, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=can%2527t+get+picture+on+samsung+tv PDF link annotation
    • http://golixudib.mypressonline.com/zinedutativutonurobosasuf.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/876fd07c4a.pdfIn PDF document text
    • https://cdn.sqhk.co/kapokosop/wJ1ujh9/fun_words_that_start_with_a_k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_5fd619c37ce7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489422/normal_6018066d521ce.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/hbiagds/scorpion_mortal_kombat_11_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/jlic1gj/top_up_paypal_with_btc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_60279124ce62b.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/7793085.pdfIn PDF document text
    • http://sushibara.net/sat_math_2_prepscholarwgsoh.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/rurikujolibebupex.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/gusibote.pdfIn PDF document text
    • https://repamepofasepa.weebly.com/uploads/1/3/1/4/131437198/tifafu.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/rawesaragegugar/agar_tum_mil_jao_song_wapwon.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/10th_new_syllabus_english_guide.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_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 5220 bytes
SHA-256: 0334652298487b1c9d95712ac5cf92fdf576787fede4831663c8d3cf108bf2a5
font_01_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 10616 bytes
SHA-256: b54340266bcd5d3fe20fda923dbcf5c2069ce69782334f670d871ae1cec2ec5d

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