Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e56ecd44d92816…

MALICIOUS

PDF

78.7 KB Created: 2021-04-26 13:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3a26e49e75fc7458516bf122b2587099 SHA-1: a90019804c76c8bb4205f30e9a84832b80d136d7 SHA-256: 17e56ecd44d928166b9c6c7b2747e89deab55210e4108ad7e71f6c633ad88416
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, but no clear textual lure. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=what+is+the+book+a+bad+case+of+the+stripes+about PDF link annotation
    • http://fofumumitem.medianewsonline.com/male_bodybuilding_workout_plan.pdfIn PDF document text
    • http://sewalenugebob.iblogger.org/viwutojowunime.pdfIn PDF document text
    • http://debuged.mywebcommunity.org/systematic_botany_of_flowering_plants.pdfIn PDF document text
    • http://jejepofat.22web.org/hazardous_biological_agents_regulations.pdfIn PDF document text
    • http://ideaita.fun/xutodepixawadilof2418.pdfIn PDF document text
    • http://good-production17.site/rijotuxirulaxirakip7lrse.pdfIn PDF document text
    • http://znasila.ru/nuzupixozovumuduwiv1bina.pdfIn PDF document text
    • http://s7hmus.org/nalurugujixegeltu5pe.pdfIn PDF document text
    • http://bitcoinov.site/weight_training_program_for_female_beginnerslwn49.pdfIn PDF document text
    • http://airbin.top/whats_up_danger_spider_man_free_downloadh5hbr.pdfIn PDF document text
    • http://goossyy.online/how_to_do_cad_designihrvo.pdfIn PDF document text
    • http://lanujozawodu.sportsontheweb.net/detailed_lesson_plan_in_english_grade_4_adjectives.pdfIn PDF document text
    • http://volavajowu.22web.org/capitulo_3b-_2_realidades_1_answers.pdfIn PDF document text
    • http://zozilejumulis.22web.org/types_of_dogs_with_pictures_and_names.pdfIn PDF document text
    • http://bigops.fun/pencemaran_alam_sekitar44cif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/jigibosibiwig.pdfIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/22242409982.pdfIn PDF document text
    • http://suxikikafib.epizy.com/2647559821.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/tukazenawunuxerijovo.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/vazujenejo.pdfIn PDF document text
    • http://robopawize.epizy.com/55469759739.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/71187867977.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_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 5428 bytes
SHA-256: f459c98a5a9d7b218389c2ea57f34346c1d4f7743b39c143c4a28f4f6c36e696
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 10944 bytes
SHA-256: 7911b764b81a80539d15c2727dd79a2f12b470059d87b645c6a1507c309870da

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