Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38bea1e68b98714…

MALICIOUS

PDF

80.8 KB Created: 2021-03-14 11:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 99f2300bc6eb8bcdae4bf7f55402d66b SHA-1: eb0994df79cb8b6fb821f06e83fb0d40c3d26954 SHA-256: d38bea1e68b9871415999e7048f4076e643042498aa87cae0bc4eb04232e6f77
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF documents, indicating a link farm or spamming operation. The document body, though heavily obfuscated, suggests a lure related to temperature units. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/wb?keyword=cuales%20son%20las%20unidades%20de%20temperatura%20y%20sus%20equivalencias PDF link annotation
    • http://firstflirts.site/why_is_child_led_learning_importantsrfy5.pdfIn PDF document text
    • http://xirapanagix.getenjoyment.net/annexure_d_for_passport.pdfIn PDF document text
    • https://dajadigab.weebly.com/uploads/1/3/2/7/132712332/kedukawibo.pdfIn PDF document text
    • https://nofawukamo.weebly.com/uploads/1/3/5/3/135347109/94c46d39325624.pdfIn PDF document text
    • http://idealica-ufficiale.site/vazijulifivixaftzx7.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/linking_words_list_english_german.pdfIn PDF document text
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/dafisifabokagul.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/supply_chain_logistics_management_4th_edition_free.pdfIn PDF document text
    • http://anyita.space/xibirudovawuxulpl5t7.pdfIn PDF document text
    • http://amsidisi.xyz/60997535520ukqjz.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/191757f.pdfIn PDF document text
    • http://rankingcoach-apps.com/17551716313pqrrm.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/wesezuzuvalirik/rofejidetatezibupurisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47648b17-d236-49cf-af07-650922943638/garmin_dezl_570lmt_5.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/bpi_savings_account_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/biblical_fasting_and_prayer.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/field_of_glory_2_beginners_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/gowales.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/xerigaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c8e8a4-1abf-482e-bdb6-693c2a7f1b21/titus_andronicus_tamora_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/91376969091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738fb1a9-34ef-48c0-a33b-5df437897612/what_does_cultural_landscape_mean_in_geography.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/lufonuvirokemafuzot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fafa77d-394e-4cc3-b014-16303e4d63fe/libro_caballo_de_troya_8_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0662ccbf-2e92-4178-8366-7fcd140dc7fe/marimavetopaj.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_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 5412 bytes
SHA-256: 16d9042d0d1f65d274b94744ab8474c097ed7fc618dd43882f706bed7cb999c1
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 11904 bytes
SHA-256: fd8d1e76f68516bb7244e7ae3bed349c090a22dffced8870192af93629a5742c

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