Malicious PDF — malware analysis report

Static analysis result for SHA-256 451e6665166f1b19…

MALICIOUS

PDF

75.8 KB Created: 2021-03-05 07:00:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2a86cdc74872904a0b2081fbcfa30053 SHA-1: 995e4b9f0d640f689d2cf52ab77c8ceb8cc4b49a SHA-256: 451e6665166f1b1947dbd6dc308b203ed398c635811dc79ff56753d4d5faf244
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The embedded URL 'https://lozipotod.ru/strik?utm_term=moral+stories+in+english+fairy+tales+new' further supports this, masquerading as fairy tales to entice clicks. ClamAV and ML classifiers also identified this PDF as malicious, likely a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/strik?utm_term=moral+stories+in+english+fairy+tales+new PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fd5fdc74f90c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376858/normal_6005c92191600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_6032fe81ed178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451549/normal_602c4da3f20d5.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/perspective_projection_in_engineering_drawing.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/warrior_cats_name_generator_quotev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494888/normal_5fdda5334e52d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/76457533006.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_e5edc01caec742a6975779a5d12e4980.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/84917704811.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/lcm_hcf_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/xukegub.pdfIn PDF document text
    • http://waduxixefe.rf.gd/xagikibenewusi.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/beronafivonabof.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_8f605344e90c4d768b7512051d1357ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/android_studio_emulator_not_starting_windows_10.pdfIn PDF document text
    • http://zunuzetipe.epizy.com/how_to_replace_ear_pads_on_sennheiser_hd_4.50.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_2595b1bc498441619b1a75f6a4318af2.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_b6e8ae6dc919420aa64ad05016335b24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/free_addition_regrouping_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/22605392945.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/44665114515.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_390d96178e7a49c4a1cf9d0fee5220b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninasivol/fomena.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_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 5228 bytes
SHA-256: 035690c8a23363973f1dc951b913313c66e4fe68245cc1013bd4ad209ff4b543
font_01_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 10208 bytes
SHA-256: eebf4ef0bd16da970810c8acff7c26e51a2700404196d2f13308dd40722917ed

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