Malicious PDF — malware analysis report

Static analysis result for SHA-256 4901360f2e27dc6c…

MALICIOUS

PDF

76.8 KB Created: 2021-03-28 10:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3a71b80d4f82be5f7105a35e32f870d8 SHA-1: b0f13949758826f1491fe09137ad03a10cf0bdab SHA-256: 4901360f2e27dc6cc6a06e12c45433834b4b5d92949b9647fe5f27c198dcdeb7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable or unknown reputation domains, suggests a phishing or redirection scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially misleading terms like 'microsoft access macbook', further supporting a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://midufefew.ru/123?utm_term=microsoft+access++macbook PDF link annotation
    • http://xotuvezaramapez.22web.org/collage_software_free_for_android_mobile.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/time_capsule_movie_cast.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/73808100827.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/mixed_articles_exercises_with_answers.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/komisanesivesomup.pdfIn PDF document text
    • http://kovatawuwaluxud.iblogger.org/tikomakaloterir.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/blockchain_python_book.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/white_rodgers_1e78-144_reset.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/58859447898.pdfIn PDF document text
    • http://jesemozoki.22web.org/vuxojelonugewivonekafuxob.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/vukusa/nitrogen_cycle_steps_explained.pdfIn PDF document text
    • http://vuvesafuguf.epizy.com/mapa_de_carreteras_cantabria.pdfIn PDF document text
    • http://gavofime.atwebpages.com/14344018710.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_f7e5401cedcd46cbafe306608da9bda5.pdf?index=trueIn PDF document text
    • http://jeruzofifisamen.rf.gd/archero_abilities_guide.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_dc669080331445f883c9cae825a39751.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/jexok.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_7ea5e0c301fd4d24b2b49b1f32dc4ee6.pdf?index=trueIn PDF document text
    • http://renirorevebu.epizy.com/xivukejoseguvusedak.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_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 5204 bytes
SHA-256: 565833d9603947a5de6437e07cbb7426558c8b63ad817ec0a810d56dc6768884
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 22016 bytes
SHA-256: 176e773c262acad998feadc2809404f4685031d3210001d4df49073451d4cdc0

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