Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddfa8c8fbf4c32d…

MALICIOUS

PDF

83.3 KB Created: 2021-03-12 03:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 13aafa2bbec58afa4499ca9ffab92397 SHA-1: a2ba46b24b6f89dca3ec333ee0389dcef8c9aad4 SHA-256: 7ddfa8c8fbf4c32d5e9fc99a06657095f40fe06e25cb3aae9cc2bdb1601c3e65
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to obscure malicious intent. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://fokemale.ru/strik?utm_term=aprilaire+wifi+thermostat+app PDF link annotation
    • http://paxijivatebul.getenjoyment.net/a_raisin_in_the_sun_act_3_scene_1_short_summary.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/sindrome_de_cansancio_cronico.pdfIn PDF document text
    • http://botojagi.iblogger.org/jasper_report_export_excel_sample_java_code.pdfIn PDF document text
    • http://nakozek.mypressonline.com/rebarixaburupevikol.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/5_tibetan_rites_proven_benefits.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/pozofuxal.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/executive_assistant_to_the_president_job_description.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/bible_trivia_questions_and_answers.pdfIn PDF document text
    • http://xubufavogulu.iblogger.org/can_any_router_work_with_fios.pdfIn PDF document text
    • http://xugafigipi.22web.org/5771054750.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/nuzeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_26622de64f61405fac926b6c4319f63f.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_8f77e662c60d4acebaf825b83bedea6e.pdf?index=trueIn PDF document text
    • http://fezozebofafex.rf.gd/80479347921.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_19d09586380245dc8dce889600c8db0d.pdf?index=trueIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/principles_of_effective_oral_communication.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_6a44f3b374814c0d8b368bd8a0e6add3.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_e6ad31d02cad402ab92466de458652cd.pdf?index=trueIn PDF document text
    • http://tulajadulixo.myartsonline.com/sukiwix.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_dcd53f658dab48a9ac87d34b3d1860e9.pdf?index=trueIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_2c40d2c2081a4d4d8f8fb8ea4176757b.pdf?index=trueIn PDF document text
    • http://sewobixisizazo.rf.gd/gilatazisupaxagajep.pdfIn PDF document text
    • http://vogafaxusa.epizy.com/79817120382.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/nafiwojutodewuje.pdfIn PDF document text
    • http://jogukazulani.epizy.com/como_ser_un_lider_efectivo.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_ec051fbbf11e48a9acf553430a107203.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 5220 bytes
SHA-256: 45dd59f92b4c0e97fd0670faa3253073445f988e7cb21bbf9cfc30a6bc72631c
font_01_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 11480 bytes
SHA-256: 7a399ea79c335db68f397061046da5d87ee60e069e4f82fa730771d90d0af8b6
font_02_sfnt_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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