Malicious PDF — malware analysis report

Static analysis result for SHA-256 10244504d16aeeff…

MALICIOUS

PDF

76.6 KB Created: 2021-04-04 15:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bae1272c265a240525dc50bc71e94b57 SHA-1: 5b2769fa9418387c9e28fb01dc7893b229fad1f6 SHA-256: 10244504d16aeeffd6d67167dea18fb04e2bcc267a535169f526d9b53e3f5c31
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs were extracted, many pointing to disposable hosting, suggesting an attempt to distribute phishing content or redirect to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable domains.

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://bologen.ru/wix?keyword=first+string+on+ukulele PDF link annotation
    • http://lozolupamo.mypressonline.com/tenancy_agreement_form.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/15290481824.pdfIn PDF document text
    • http://savineme.mywebcommunity.org/ziweridipitesajupuki.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/linkedin_profile_template.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/zunuraragato.pdfIn PDF document text
    • http://fusojosejivo.iblogger.org/99207902148.pdfIn PDF document text
    • http://dikagowoxi.sportsontheweb.net/36978864497.pdfIn PDF document text
    • http://zaroramo.22web.org/letter_of_cancellation_of_contract.pdfIn PDF document text
    • http://debakabuxaw.22web.org/tomodachi_collection_personality_guide.pdfIn PDF document text
    • http://dobafeser.66ghz.com/splash_screen_android_studio_kotlin.pdfIn PDF document text
    • http://kepupefidi.iblogger.org/composite_functions_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/28534954741.pdfIn PDF document text
    • http://sikujorusa.epizy.com/4894335275.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/21855701182.pdfIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/carian_cole_torn_espaol.pdfIn PDF document text
    • http://xuvotawelotito.epizy.com/free_fitness_body_measurement_chart_template.pdfIn PDF document text
    • http://farixotipiw.rf.gd/alif_ba_ta_book.pdfIn PDF document text
    • http://dogefifuga.rf.gd/harlow_solid_plain_font_free.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/29162059392.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_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 4660 bytes
SHA-256: 447caf0fa74941a5c7a8611f984898ef4d224ad6bc4b9cb3b619d58328ce6486
font_01_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 11144 bytes
SHA-256: af777443dd526640a44f0776db2168d4ffb0d2a1d6936281a5eeaea42b293958

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