Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe5b2f6aa44ef3b…

MALICIOUS

PDF

74.4 KB Created: 2021-03-21 02:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5efcdb4fc3c999fceec2771ae548fea2 SHA-1: 6dd3c29a9250b870279d71307a3cf8fb31af899a SHA-256: bfe5b2f6aa44ef3bce8e3904f75d22f496d843ae423326e55075788a402e2a0a
226 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged as a link farm. It also includes a heuristic indicating a password-protected archive lure, suggesting the document is a decoy to facilitate the download of a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/award?keyword=gilroy+atlas+of+anatomy+pdf+free+download PDF link annotation
    • https://sezitolu.weebly.com/uploads/1/3/4/3/134367117/mikubazejule.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/vuxufofukigowo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_ee5ba6ad383f4ce089cc09f65783aa35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf811d9e-29c1-45a2-a091-d5fc1cb3df57/compound_interest_questions_for_competitive_exams.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/lilimakaviwakefis.pdfIn PDF document text
    • http://bodagoge.epizy.com/question_answers_of_no_men_are_foreign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e640afef-10f0-46d9-b333-fa2f3e68a405/taurus_g2c_9mm_pistol_bullets.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/quotation_template_word_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/362e41cc-068a-44bc-86c0-559535eb9975/zoxivopezok.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/diccionario_griego_espaol_biblico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fee3bc2-c9ad-407d-88c7-3615baffb600/good_interview_questions_to_ask_a_job_candidate.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/resurikutokizabijexivutum.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_5f45e97bbdcc4880b1e33d9424d2de0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c66a82-6925-47ee-82a7-2aa7fe7d7f77/computer_science_illuminated_chapter_12_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/lidocaine_hydrochloride_msds_sheet.pdfIn PDF document text
    • http://wofaketizezoja.epizy.com/all_my_life_krezip_sheet_music.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_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 5412 bytes
SHA-256: c62d556805aa77daf3193dcd92c577bb514c65e8818b08aaa9ed0fb6ff988dd1
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 11660 bytes
SHA-256: 2241471a5c2ea5ea5eb85fd2e874a750d78b2834f2ce7a02e8f903078c5c87f5

Open this report in the interactive analyzer, or submit your own file for analysis.