Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d6bcaeb0bcf5f0…

MALICIOUS

PDF

81.4 KB Created: 2021-03-28 01:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f44a09f6c46027614deaf4bfbf51a4c2 SHA-1: 53cab42afdd1bacb7738302b7f1a80bd971e9055 SHA-256: 72d6bcaeb0bcf5f014f20caca48141ea324e294308fcef02ffcdef896779f15f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://fokemale.ru/strik?utm_term=ryobi+leaf+blower+won%2527t+start PDF link annotation
    • http://zijaditenup.getenjoyment.net/imran_tohumcu_ate_ve_su_2.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/22532.pdfIn PDF document text
    • http://kogudajinisu.iblogger.org/one_group_pretest_posttest_design_sample_size_calculator.pdfIn PDF document text
    • https://luketekovagitor.weebly.com/uploads/1/3/4/2/134236109/padaxugeweko.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/biological_molecules_pogil.pdfIn PDF document text
    • http://vuletotam.scienceontheweb.net/advantages_and_disadvantages_of_computer_based_information_system.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/ludazizowivivivuxaki.pdfIn PDF document text
    • http://duwuzoruperiged.scienceontheweb.net/are_ohio_death_certificates_public_record.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/51ba3fee-32f9-41a7-9319-068fde8a4060/the_bluest_eye_sparknotes_quiz.pdfIn PDF document text
    • http://muxofitum.rf.gd/jejazezekemo.pdfIn PDF document text
    • http://narakeke.rf.gd/deep_learning_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d706ab-4fe3-45ef-9db7-df57cbeb2c81/gobifagagirumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43313559-2369-4688-bc6b-7e7e1057dbd8/oracle_database_19c_upgrade_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2beb737d-17d4-4353-88ff-66bae5085ced/82384482381.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/percy_hedley_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/akkurat_light_pro_regular.pdfIn PDF document text
    • http://zofinuf.rf.gd/have_yourself_a_merry_little_christmas_original_lyrics_judy_garland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5975cda6-2735-4ed0-9e49-ffcd57c06839/nomonegojodamumopagi.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/19992839881.pdfIn PDF document text
    • http://pilulozames.epizy.com/crossfit_workout_routine_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/what_the_bible_says_about_false_idols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26690492-a5e2-434f-bcaa-9e42b1655569/33272038517.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 4924 bytes
SHA-256: c3b0ab5ce492e1a5133da36720ef491e0796e6a47730e4f15b69f7215c6f107f
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 10932 bytes
SHA-256: 4815a364639e318caa253982e2a92e3e99a0cd20fdd8d3d7da5dacfbd6dd4048
font_02_sfnt_off000129d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71