Malicious PDF — malware analysis report

Static analysis result for SHA-256 e753731a6a0d7efb…

MALICIOUS

PDF

82.4 KB Created: 2021-03-10 10:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8e6230420586910118ba0618954d354b SHA-1: f6e88b8f622c9e6bdc48981c9f52872ec8f0063c SHA-256: e753731a6a0d7efb6028d0dc84602c2a8cdcc3b11adc5c7301a5439048ab3e9e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to suspicious or malicious redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to exploit kits or phishing pages. The document body, though heavily obfuscated, contains references to nuclear energy, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=what%20are%20the%20pros%20and%20cons%20of%20nuclear%20energy In PDF document text
    • http://rebibedo.mywebcommunity.org/craftsman_30cc_4_cycle_weed_eater_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/ojcgf3D/age_of_apes_guide.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/15461776559.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/QDfgiez/70_80_love_songs_youtube.pdfIn PDF document text
    • http://jexekiraj.sportsontheweb.net/88649537179.pdfIn PDF document text
    • https://cdn.sqhk.co/sebikavup/7ifjcP9/vatejojorad.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/Wnid4he/97714755196.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4b0a20-cdfb-4c1e-b11b-bb73b8a4db8b/72864200342.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/cinema_4d_r15_plugins_free.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_6b3cef3544014f12b61ca8519221bb4f.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_7094889ccf504d0591cf461079ab1868.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijudow/acrylic_mirror_sheets_cut_to_size.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/essentials_of_clinical_infectious_diseases.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/37280101315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9091373e-83d4-45db-bf8c-a7855a1020e8/sifomasunajosewopujitib.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/17095473947.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/ohio_attorney_general_form_990.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/baahubali_malayalam_songs.pdfIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_70eee70dc8294af691ac4a4a5cebe7cc.pdf?index=trueIn PDF document text
    • http://pesetunal.onlinewebshop.net/pride_and_prejudice_movie_online_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/51342267989.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_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 5532 bytes
SHA-256: 404d64ad091a88cf90ce9ad0fc66ce36c850f98e25dfccc214ee89633d455ab1
font_01_sfnt_off0001188e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188E 10424 bytes
SHA-256: bc715b6b1ec6e0c4f48b670dd21909b72cbce070a2d0fde16d9188bf43c63a33

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