Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27f0047b1ca335f…

MALICIOUS

PDF

78.5 KB Created: 2021-04-15 09:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c940f9f8a5703960a033f798019bc31b SHA-1: 286bad46345d226e89787c2d6d55c5f3d19ebecd SHA-256: b27f0047b1ca335fb661495fb5fe5c55497c5a1f6a23e92a57a1015d6dd833fd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent link pointing to a suspicious domain, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to popular search terms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=attack+on+titan+season+4+episode+4+ending PDF link annotation
    • http://zuraleres.mywebcommunity.org/xupujibavudum.pdfIn PDF document text
    • https://tikofasej.weebly.com/uploads/1/3/4/6/134615027/tatatofatepof.pdfIn PDF document text
    • https://pipefedib.weebly.com/uploads/1/3/1/3/131383483/kolux_jemevu_kovajutusifi.pdfIn PDF document text
    • http://duwuzoruperiged.scienceontheweb.net/wits_application_form_download_2020.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/area_of_irregular_shapes_year_6_worksheets.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/86159916146.pdfIn PDF document text
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/voxudukejasapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesufebavarobi.rf.gd/overtime_request_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/nouns_exercise_for_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ca8107-76bf-4b8b-a784-4bb37e356c66/bosch_silence_plus_46_dba_how_to_start.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/80637104993.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/overlord_light_novel_volume_11_download.pdfIn PDF document text
    • http://momodew.epizy.com/wigekorufapopudefenepagiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0167fef0-fa0a-4919-8aa1-d101ceb35133/how_to_start_a_senior_speech.pdfIn PDF document text
    • http://xebupiwemumak.rf.gd/why_is_flash_player_blocked_on_chrome.pdfIn PDF document text
    • http://wekujugom.epizy.com/little_charleston_line_dance_step_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/baby_jeopardy_game_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0584ed-db27-4b2f-b8d0-2763f3e621d1/metro_2033_redux_gameplay_switch.pdfIn PDF document text
    • http://lutepotazor.onlinewebshop.net/ap_psychology_exam_practice_questions_unit_3.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/webster_synonym_and_antonym_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/zero_conditional_worksheets.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_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 5256 bytes
SHA-256: 0713ca1d345e82613ec328b0440ed619b48cd4f64538ae94eb5f232d933d8bda
font_01_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 11204 bytes
SHA-256: 7258d56aa96ae13542dc06cf214cb87a07c2e24c651fe885d33e4cca1728b623

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