Malicious PDF — malware analysis report

Static analysis result for SHA-256 30bef6d715ef09ab…

MALICIOUS

PDF

81.1 KB Created: 2021-03-21 23:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2c2fc1e2330d90f888ca5678898da5be SHA-1: fd0be6db681adb6c32baef96064540465c117bcc SHA-256: 30bef6d715ef09aba7eea2cacaa30b434dc283f6620be460e6dd15383f67365f
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm on disposable hosting. The embedded URLs, such as 'https://crophysi.ru/award?keyword=assessment+evaluation+in+higher+education+pdf', are designed to lure victims to potentially malicious sites. The ML classifier and ClamAV detection further support the malicious classification, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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.
  • 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.
  • 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://crophysi.ru/award?keyword=assessment+evaluation+in+higher+education+pdf In PDF document text
    • http://rogofede.22web.org/majirusowi.pdfIn PDF document text
    • http://pepufur.22web.org/imodstyle_remove_scar_guide.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/97173215195.pdfIn PDF document text
    • http://mivifukatovaga.getenjoyment.net/sea_fishing_rigs_for_boat.pdfIn PDF document text
    • http://kizawaro.22web.org/mentalist_season_2_english_subtitles_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudazakagozugaj.epizy.com/48609774438.pdfIn PDF document text
    • http://latowetutut.epizy.com/1_cm_graph_paper_a4.pdfIn PDF document text
    • http://lixugojobipiwof.epizy.com/the_powerscore_lsat_logic_games_bible_workbook.pdfIn PDF document text
    • http://jumebesatupa.epizy.com/52897513666.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_3fcb8fb44db74da996bbc945a3c44c3b.pdf?index=trueIn PDF document text
    • http://dobupefibukin.epizy.com/ansi_encoding.pdfIn PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_5150fbf6662f4ac085e142f65af3482a.pdf?index=trueIn PDF document text
    • http://dejogamolefip.rf.gd/texas_mechanic_s_lien_affidavit_form.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_70359b32b88a4eb0aa9adc8fcc345f42.pdf?index=trueIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_f0f4e41193ad4ff2b42bb5b1d23f58cf.pdf?index=trueIn PDF document text
    • http://fifomivosa.rf.gd/utorrent_pro_apk_app.pdfIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_2a04601e8de94120a6db62903fc3c37f.pdf?index=trueIn PDF document text
    • http://gevejonitu.onlinewebshop.net/8123567990.pdfIn PDF document text
    • http://repogadobuwiri.epizy.com/film_benyamin_sueb_biang_kerok.pdfIn PDF document text
    • http://bukuzagalu.rf.gd/57611236956.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/plataforma_streaming_da_disney.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_b5d6d2d60c76445d8ffcb57132ff4bad.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_62d1484e4e8040d3926eb17adea87f81.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_66bb53cbfdec4edcb6c9956a94c1e4df.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_f53926cf577247c98d55b573fc009a59.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_34ed340dc21e4d15bb5627011cbbf078.pdf?index=trueIn 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_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 5620 bytes
SHA-256: afc32507b3c50cdf31ad663d3727ebe15562ceb6b38824ebdc58254a01a619a3
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 10996 bytes
SHA-256: 5ad1af285fce975cde1c557f4fe0a95ddc725039ce08f8c54bc7375faf298152