Malicious PDF — malware analysis report

Static analysis result for SHA-256 593b71531d3dfb43…

MALICIOUS

PDF

94.8 KB Created: 2021-04-02 14:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 39a4667fc990acd1009f608cc7796d08 SHA-1: cffcb4de666f3c21e91ee4401d49f4245a8af76d SHA-256: 593b71531d3dfb435f963f13eadbc0fc4a62a2a87c12a5e173de6e811a453207
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=forty+rules+of+love+review+goodreads PDF link annotation
    • http://vzruvayarttraff.xyz/longman_dictionary_freev33tj.pdfIn PDF document text
    • http://igcopyrightclient.com/guwarigegowosituvok7lyb2.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/sananonatinib.pdfIn PDF document text
    • https://cdn.sqhk.co/nujamuxeg/chjhfSq/tonalufanolufubelop.pdfIn PDF document text
    • http://manthoughtswebsite.website/koduxorineretabixbo1q.pdfIn PDF document text
    • http://dobilarujokux.sportsontheweb.net/migevigenapufi.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/72568077132.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • http://myyshooop224.site/deal_of_the_day_amazon_ukam96g.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/isometric_drawing_worksheet.pdfIn PDF document text
    • http://legiontry.online/suromanez93g5e.pdfIn PDF document text
    • https://cdn.sqhk.co/dujovosu/drhjbgg/aashiqui_2_movie_for_mobile_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/2yE8StG/31770425546.pdfIn PDF document text
    • http://onenature.space/coursera_financial_aid_answers_sampleor3am.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/fikude.pdfIn PDF document text
    • http://prizinsta24.online/hot_videos_app_for_android_mobilelg54p.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/00c0475e-0193-4097-8630-fa1315b8d597/scholarly_articles_on_sex_education_in_public_schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0b5d23-9818-46ac-ad28-ac9eeb33e498/javascript_get_absolute_path_of_file_input.pdfIn PDF document text
    • http://nununad.myartsonline.com/36347856363.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/bagiboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e72ff40-7ddf-4851-a3b0-c561d22167a5/89677419984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14525e96-aeb2-4f60-8542-f6e535d78a34/ladudevoniremuweba.pdfIn PDF document text
    • http://mobukug.myartsonline.com/pupegisiwadadif.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_off000134fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 5284 bytes
SHA-256: 5162c0878f12360c68c070a6a403099d7b1778346696ecef9cae83852f26e0ac
font_01_sfnt_off00014724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14724 11272 bytes
SHA-256: d26afb814f73f16537c7b8672fde582b97ad9c6a392a79d6373606c81f4edc78

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