Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a148c1583d43f12…

MALICIOUS

PDF

71.9 KB Created: 2021-03-20 01:23:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: daa0ad8b8e37596816c346830e54f526 SHA-1: cc5553ab5f5c027741c276237d5a2a902907a2fb SHA-256: 0a148c1583d43f125fc875f1f1865bf550fc3ddf3de91d42069ab3f6ddb9dc11
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with several pointing to disposable hosting and acting as link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, a common tactic for disguising malicious links.

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://lozipotod.ru/123?utm_term=worksheets+for+kindergarten+letter+d PDF link annotation
    • http://converstarget.ru/dunuwowixujivogijib6qjiv.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/xemawi.pdfIn PDF document text
    • http://shopsupergood.site/bipuwuvikotwxjrz.pdfIn PDF document text
    • http://numulul.mygamesonline.org/99_names_of_allah_with_urdu_translation.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/kudopusivuwesusubuvivi.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/taco_bell_grilled_chicken_power_bowl_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/pazibafax/jgFhan1/ebay_bid_sniper_free_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/jdDjhij/pomapovajitosavevak.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/niwuratu.pdfIn PDF document text
    • http://klosheff.xyz/lotus_sutra_chant_meaningancem.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/0idXd9B/62460948650.pdfIn PDF document text
    • http://fitdieta.com/what_does_individualism_mean_to_you_essayrcevb.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/jiguwuzobozobaz/bootloader_arduino_atmega328.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/vobizegu.pdfIn PDF document text
    • http://fadezanunadafik.myartsonline.com/aptitude_test_for_bank_job.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/bless_me_ultima_movie_free.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_0491493c94b4425c8239600d4ad8b9e7.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_49ce2716160342b48629959ce17dfb0f.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_d09e97244bee439e90b90c085b487b57.pdf?index=trueIn 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_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 5244 bytes
SHA-256: 82e55d5efaf3947e18a03552d054f669b7b7328c7a0d9d61107f5545a08cb6e6
font_01_sfnt_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 11120 bytes
SHA-256: 85a93a74794e3e9cba1fb91d9736e01a94ed56bc0c41cdfa6bc720e957f510a9

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