Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ab51f4f249455a…

MALICIOUS

PDF

89.1 KB Created: 2021-03-30 17:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5bfb44944f8c81ac0c7e2cc96008f3cf SHA-1: d4702d1dc1252d1dfdd6ae58dc0f01ca597ca5d9 SHA-256: 21ab51f4f249455a1979ab621852946e762a023c5b8adc15a9cbed78699fb175
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'jrotc cadet uniform guide', likely designed to entice users to click on embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://vilenefex.ru/wix?keyword=jrotc+cadet+uniform+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408481/normal_60089044c7c40.pdfIn PDF document text
    • http://nefisexisaw.iblogger.org/aankho_teri_aadat_hai_song.pdfIn PDF document text
    • http://zazonowipudu.66ghz.com/15810367844.pdfIn PDF document text
    • http://kononameve.mywebcommunity.org/priere_tres_puissante_pour_attirer_l_argent.pdfIn PDF document text
    • http://smartcreditus.info/access_point_configuration_utilitydp4r6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475209/normal_5fe1c6492905c.pdfIn PDF document text
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/mopawinom.pdfIn PDF document text
    • https://jonolepazom.weebly.com/uploads/1/3/4/5/134520471/nusukaletirilajizuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_5fe99447e4fdb.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/ralotuwujalibunemosi.pdfIn PDF document text
    • http://pijakonojimuw.iblogger.org/fortnite_battle_royale_game_size.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/mig_welding_machine_specification.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/ramiwoxo.pdfIn PDF document text
    • http://technodom11.com/linajiparurebijamdj1bi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fe09eff4fdb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_600d289fec3d1.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keladuwuk.rf.gd/consumer_reports_digital_gift_subscription.pdfIn PDF document text
    • http://mirepili.epizy.com/88900894502.pdfIn PDF document text
    • http://jesebikalag.epizy.com/odisha_job_information_2019.pdfIn PDF document text
    • http://bosulug.epizy.com/pcr_polymerase_chain_reaction_procedure_information.pdfIn PDF document text
    • http://pepajefosub.epizy.com/zowusivaxifanebog.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 5120 bytes
SHA-256: 439954b004b7de273216092aee15ef8436dd25f796a4624b2607158d4e67551e
font_01_sfnt_off0001325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325F 10396 bytes
SHA-256: 1f3701fae8fc3c635ce0ef9a5009c5e1969908a8c769ad75f6d86da0729c6452

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