Malicious PDF — malware analysis report

Static analysis result for SHA-256 6403e758ed2ffa74…

MALICIOUS

PDF

74.8 KB Created: 2021-06-03 17:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ff6918f5710c89f692f870a77014007b SHA-1: 9b327356ad4008a53f778958ad59cd99b3cfe5be SHA-256: 6403e758ed2ffa741d2af41ce2a37d5c4e29f4153ec5ed7c95c4d2e14904a0e0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting, suggests a link farm designed to obscure the ultimate destination. The primary malicious URL identified is https://oniceh.ru/pbw, which is likely used for phishing or to serve a secondary payload. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/pbw?utm_term=how+to+sell+to+a+business+owner PDF link annotation
    • https://basisini.weebly.com/uploads/1/3/4/7/134775363/gegulemozom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463002/normal_5ff205038f710.pdfIn PDF document text
    • https://dubuweni.weebly.com/uploads/1/3/1/6/131637072/6017242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_602b3eae39f6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5fe4af494b09c.pdfIn PDF document text
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/fekujepajewusu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fce97985e1de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikoborumun.pbworks.com/w/file/fetch/144522738/85296161456.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/judavadodobetadufebunali.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/tecrbe_taktiklerle_paragraf_soru_bankas_tm_zamanlarn_tm_snavlar_iin.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/glencoe_physical_science_chapter_18_review_answers.pdfIn PDF document text
    • http://magobok.pbworks.com/w/file/fetch/144555765/twilight_breaking_dawn_part_1_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/29137788510.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144525342/nelson_11_physics.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/xawewajomum.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144501774/aditya_hrudayam_stotram_odia.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/w/file/fetch/144552468/stickman_football_gameplay.pdfIn PDF document text
    • http://liguduper.pbworks.com/w/file/fetch/144451656/75763162766.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/how_to_use_gardners_theory_of_multiple_intelligences_in_the_classroom.pdfIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/144427644/jedeg.pdfIn PDF document text
    • http://felefejimax.pbworks.com/f/unblocked_games_crew_cubefield.pdfIn PDF document text
    • http://jetubabup.pbworks.com/w/file/fetch/144564387/fast_and_furious_5_full_movie_download_123mkv.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144422034/text_features_first_grade_lesson.pdfIn PDF document text
    • http://lipadune.pbworks.com/f/opera_browser_64_bit_windows_10_download.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_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 4872 bytes
SHA-256: cc05c75d141fa2ba260fe0ae0ac7157191223ee3c9b00b79065594c6fe6b2647
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 11304 bytes
SHA-256: e1be9dd041fc501db1aa29120aa3e815a58f8f148668f8ec0547da4bd2a4fe48