Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc583c657efdcaa1…

MALICIOUS

PDF

84.1 KB Created: 2021-04-15 01:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e06ba810d2ac19c5ca159538fb64559e SHA-1: 726f721c0fd5ad75f125831f5216bf258dc40372 SHA-256: bc583c657efdcaa1c6075e22e9a04f5079b6d567ba9e996b0c74ed5db5b4e374
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=tell+me+what%2527s+on+your+mind+quotes PDF link annotation
    • http://nibajafij.medianewsonline.com/benzimidazole_drugs.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/dovilo.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/jdgijaT/rune_factory_4_big_fish_contest.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/lemodas.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/6ieWgQh/lighthouse_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/suwuwewazaka/HKhf8ha/xupot.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/uhdvFib/coastal_drowned_river_valley_crossword_clue.pdfIn PDF document text
    • http://pexukakadom.22web.org/74100836366.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/ZsC9Ria/97608043815.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/ibEX9je/77936156980.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/suwovunoka.pdfIn PDF document text
    • https://cdn.sqhk.co/nizaveni/1hdiihg/the_ants_go_marching_to_war_original.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/jwjaihc/ahlamalik_williams_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/haa1Kjg/mavedovibawuku.pdfIn PDF document text
    • http://bavedibigilomit.66ghz.com/31309761577.pdfIn PDF document text
    • https://cdn.sqhk.co/nabolokewido/bribjhg/tanatotipivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cdee47fa-e3d3-4911-b295-7b2bc2d389ac/call_me_by_your_name_book_second_hand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63274fdb-117e-4092-b71d-2ed64f548d5e/ergo_360_infant_insert_pillow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f490f8-09df-4c25-b127-0451c72a12b4/mavedizifadutuvovadanu.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/72582426833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e70590-9d2c-4b72-9775-e2d5b3e72d3a/husqvarna_yth24k48_battery_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e808916-b4fa-4b15-9887-c1ae972eeec1/fataximomojexul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 5252 bytes
SHA-256: 6bee3e92833c530d6ae82ce829b0b91e57a99fc0d6da1666db018a5da155a5ce
font_01_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 11600 bytes
SHA-256: 0311b281f35c45947af127a637d9365b0a1df1688e5097b530e33ffc1f317370
font_02_sfnt_off0001359f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34