Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cb0ed568f44f4a…

MALICIOUS

PDF

86.0 KB Created: 2021-02-13 08:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9567830cbfe1163d7872cde55d8d182c SHA-1: 810be04fa94faa93e57524a3a4ab3ecf942ae824 SHA-256: b3cb0ed568f44f4ac7e300fa25dbe0c433890644bdc0f23e5c261de22063689f
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, directing users to a link farm hosted on disposable domains. The presence of numerous embedded URLs, many pointing to potentially malicious or unknown sites, supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=spanish+imperfect+tense+worksheet+pdf PDF link annotation
    • http://mainsale.pro/nurigudax9iab2.pdfIn PDF document text
    • http://helper-badges.com/tokyo_ghoul_unravel_mp3_download_320kbps4c7c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fdad61025da6.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/10096fcdae.pdfIn PDF document text
    • https://bejuzozomixur.weebly.com/uploads/1/3/5/9/135966319/2491cd4d2bf9597.pdfIn PDF document text
    • http://petrol-v-pol-price.site/vupofidobiwafasurawopk4b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_601d4d97d5d9a.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/vaganepabux_levupupabisux_gifizo_zozak.pdfIn PDF document text
    • http://asta-stroy.ru/wekobezd2viv.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/5180349.pdfIn PDF document text
    • https://kewegiru.weebly.com/uploads/1/3/1/4/131438086/satulobevukoge_zukuxozanavur_tabexufalepeder.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/sowewazulejewi/android_version_hd_pictures.pdfIn PDF document text
    • http://xumozokuzutibuk.epizy.com/libudojetinu.pdfIn PDF document text
    • http://fawogalupa.epizy.com/figure_of_speech_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/azure_function_app_manual_trigger.pdfIn PDF document text
    • http://xibiwoziveva.epizy.com/25709267875.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_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 5620 bytes
SHA-256: 787c18ffcfac8408ef001edc201fb15d5805a7ae873b4dbb1a03fa9acbd155c1
font_01_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 11984 bytes
SHA-256: 57a54e77e36061620810b0c8ca16297ad1a94e4259bb2cb6e2d13272f8b46c0a

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