Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b45cb81f3aa19d2…

MALICIOUS

PDF

78.2 KB Created: 2021-04-11 07:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c17308773051a5bbbb64837b4a8a46c9 SHA-1: 122f6f852c3f9b40a9cb534ea10da35174d6b016 SHA-256: 6b45cb81f3aa19d25a534d391cd83b98b7558e5e0a9529e3c5054eca227d7b5b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://resalured.ru/strik?utm_term=yukio+mishima+confessions+of+a+mask+review PDF link annotation
    • http://bewizasosu.sportsontheweb.net/what_order_should_i_read_the_halo_books_in.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/digitech_jamman_stereo_recensione.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/webaragaputoxadivokax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_c2095b77ea47480f9b9bad988b955ee9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvetaso/solitary_pulmonary_nodule_management_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/american_breakfast_menu_list.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/raluxumotorerotuduzagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb46b13-0c8d-4da3-8d1d-9d25e1b313db/romezevogulusuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd4dd4b-1276-4cfc-916d-8e217a423dcc/adjectives_for_falling_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde2bbe0-2474-4b0e-9bf9-798861db401c/can_you_keep_a_secret_barbie_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f97ed7a-b411-4d5a-8356-59dc2c620808/100_ways_to_motivate_yourself_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b4b153-bfd6-4b6c-8442-5e3346680053/71064908623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb71afa-b5dd-4e40-9869-64ef6a34a6a3/what_is_a_nice_word_for_e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e52b61a4-26e5-4220-8463-66299ba2352b/kapuma.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_8675f24264d54ecc92f6524487387899.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1705a3d-e038-4bcf-b6dd-54cfe350de62/the_story_of_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abcbad0-fa7d-4af9-b152-698b5c6994a0/como_fazer_seu_cerebro_pensar_mais_rapido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9091c2-ee3c-450c-bbba-1855b9395b08/raligiz.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_92c6c2e1ef2543578bb2cb2b6badf37e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/468350b5-041e-4995-80af-18549014235e/how_to_increase_pressure_on_a_resmed_cpap_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87e5a36-4e84-4e00-8f0f-b436c511b82e/tason.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/botaxozijerina.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_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 5268 bytes
SHA-256: 64f9e216f69abc07cde8164991b8d1b6982fb3f07c0578a3c9cf9dbcc48f30ae
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 10628 bytes
SHA-256: 03db0f5701514648fe3986b5e8d0fa04f6aa2eaaa03a7fdd8aa7ebbadaa022af