Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf319ddf38c85b9…

MALICIOUS

PDF

77.4 KB Created: 2021-05-07 15:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f490cb98f7f9445ce2b76e57a76a89d7 SHA-1: 21148ea93e4be818cf46abc19ba8c6d996c13e9a SHA-256: eaf319ddf38c85b981a97f8bc5c9cdce668c7aac355efffc26065dcf2f1d43aa
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were extracted, the presence of multiple suspicious URLs and the 'link farm' heuristic point towards an attack pattern designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=plans+for+a+reflux+still PDF link annotation
    • http://tryse.xyz/is_the_trials_of_apollo_about_percy_jacksonysvdy.pdfIn PDF document text
    • http://rasprodavaika.ru/bunigupigabuvanobonizelawu7mg.pdfIn PDF document text
    • http://pijabaralipori.22web.org/play_store_app_jio_phone_ma.pdfIn PDF document text
    • http://centerverifybadge.com/27036465148j50wm.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/75916317401.pdfIn PDF document text
    • http://jadenefabive.iblogger.org/apprendre_le_python.pdfIn PDF document text
    • http://nuzidixiwetor.22web.org/linen_bed_sheets.pdfIn PDF document text
    • http://telozurilesojo.sportsontheweb.net/the_abandoned_empress_novel.pdfIn PDF document text
    • http://wemepena.iblogger.org/79038259970.pdfIn PDF document text
    • http://nyvelsets.online/wizard_subclasses_5e_rankedzb3a9.pdfIn PDF document text
    • http://sazaxizixukuju.iblogger.org/how_many_days_can_a_dog_go_without_eating_or_drinking.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://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_18e6e9fcbace41039216d125288a4569.pdf?index=trueIn PDF document text
    • http://desovizipelo.onlinewebshop.net/24927899374.pdfIn PDF document text
    • http://rikilusidarule.rf.gd/pdf_and_cdf_of_normal_distribution.pdfIn PDF document text
    • http://wurunuj.epizy.com/kugapubovebinukij.pdfIn PDF document text
    • http://gusufarafedi.epizy.com/database_administrator_exam_questions_and_answers.pdfIn PDF document text
    • http://juzudine.rf.gd/android_callback_interface_example.pdfIn PDF document text
    • http://jipakevinofulom.epizy.com/totalq_business_plan_download.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_e50b22e847ae4978bbf4a3010da7b1ec.pdf?index=trueIn PDF document text
    • http://zirutabu.myartsonline.com/pobolijigapivoporugevelin.pdfIn PDF document text
    • http://nizipere.epizy.com/practical_bayesian_inference.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_15a249a44a3a48e48cf6e7de3ca42805.pdf?index=trueIn PDF document text
    • http://pirafabitibabik.rf.gd/baritone_ukulele_songs.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_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 4712 bytes
SHA-256: 2e61e84f1e4ba35ca1b2c29b008f2648da6913a2d857ebf6608e9e5da8eb197b
font_01_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 10088 bytes
SHA-256: fcdf0b80e845b378de83127fd3e37a291c1cc096950b27374e5c1b8a1bcbc7c8
font_02_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176