Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8df1c97de67e9b…

MALICIOUS

PDF

93.4 KB Created: 2021-05-17 00:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 08c20d340113ec949b8c1db895fb0bc1 SHA-1: 5798fbf531c0afb9a7749e4dfc1455d4edac51cd SHA-256: cd8df1c97de67e9b78c3cd23778285eaf2e70db40f6765e5559e75864c0aaada
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 0.9955

Heuristics 6

  • 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 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://zajinet.ru/strik?utm_term=bluebeam+revu+2017+user+manual+pdf PDF link annotation
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/1235827.pdfIn PDF document text
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/demetalirebun_bitod_xegalozapuruv_bazibimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_5fd3972a25de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fd039cc250a7.pdfIn PDF document text
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/jababakafikifajep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_6062cfa522cb5.pdfIn PDF document text
    • https://dalujukonuxuda.weebly.com/uploads/1/3/1/1/131163933/bulonitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_60293f383287a.pdfIn PDF document text
    • https://zudizobi.weebly.com/uploads/1/3/4/8/134860565/pavefopigijugo.pdfIn PDF document text
    • http://www.opentle.orgIn 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/9a369054-976a-4847-9203-5716e149c60c/92519227015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2dfd16-df35-422f-8d4b-5928757ff108/insinkerator_food_waste_disposer_stopper.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_fec2575a3f174c1bbf63a7de44d52629.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd9463e-dd29-444d-92c8-5e65ac0680e2/nordictrack_exp_1000_xi_not_working.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_82df5230cb4e449695c1f6a618b6b2b5.pdf?index=trueIn PDF document text
    • http://getapumofibejop.epizy.com/faringoamigdalitis_bacteriana_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8814aa-4b7e-41d3-a1a8-1fc09e44cf1c/matthew_hussey_how_to_get_the_guy_login.pdfIn PDF document text
    • http://lipaxunuvevi.epizy.com/what_is_an_ideological_statement.pdfIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_8f5c2eb0c7b645aab666bc84d656485e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7bde6c5-7ca9-4866-9115-6deba74d5d70/gonewibo.pdfIn PDF document text
    • http://forilojemani.epizy.com/58902245690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd693e3-3a37-4248-a103-df377d01003e/how_to_set_up_midland_weather_radio_wr-100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c09352-ccec-4134-9100-6b245765bdad/81265184447.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_6e9faad8f9cc4504836c1fdd4f072184.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea98e07b-0f80-497b-b4e4-0158df7438b1/how_do_you_make_creamy_cajun_pasta.pdfIn PDF document text
    • http://banezisiwirasu.rf.gd/global_board_games_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ffbe17b-5164-42d7-a126-57ba6bdb5c41/how_accurate_is_midnight_in_the_garden_of_good_and_evil.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012739.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12739 7616 bytes
SHA-256: 851acd3a605bf41e444b38b2ab297cae223c413658cc966aebf4bb749ca0474c
font_00_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 5844 bytes
SHA-256: 373160a17446375a48c0539d274752ed658be0420f01c127de89a8b499d3d71b
font_02_sfnt_off00013c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 12708 bytes
SHA-256: 2ea1c07323469ff19e6771b67fc450e1f54c9c54017c549463581c39668c77d6