Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8a88c960810512…

MALICIOUS

PDF

91.4 KB Created: 2021-02-15 21:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7410f810c79004f63e28b9a773d13aaa SHA-1: 3915e62fd6a307ad47a4a54c6e67f82bc63cca66 SHA-256: 6c8a88c9608105129ed5e2c0884cd771a960bc581180efcdb78b94240c0081a9
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/wix?keyword=practice+b+multiplying+polynomials+answers PDF link annotation
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/2593cfbbadb52f2.pdfIn PDF document text
    • https://rinapaluvubozi.weebly.com/uploads/1/3/4/6/134669605/a875e514d1.pdfIn PDF document text
    • http://bapozuwemixad.22web.org/fluorescent_ballast_replacement_guide.pdfIn PDF document text
    • http://puwonasomoso.22web.org/81055276134.pdfIn PDF document text
    • https://seniwotod.weebly.com/uploads/1/3/5/3/135346371/a6f0ebfb.pdfIn PDF document text
    • http://jujigosobo.iblogger.org/enzyme_kinetics_lab_report_abstract.pdfIn PDF document text
    • https://zozajiditufex.weebly.com/uploads/1/3/5/3/135309939/tiverabitiwilifagoze.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/ijggdie/sipubexugen.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/siidMGv/sandwich_restaurants_near_me_now.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/gigzhh2/miwigezipudumoxunidosave.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/hhigigi/organe_de_gestion_d_une_sas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nazonuretowu.epizy.com/vanilla_engineering_guide_elysium.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/android_sdk_emulator_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/snap_bag_tutorial.pdfIn PDF document text
    • http://sikofus.epizy.com/71675950649.pdfIn PDF document text
    • http://wexavow.epizy.com/fokewikixejizezewa.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/concrete_batching_and_mixing_plant.pdfIn PDF document text
    • http://bixerexexotepe.rf.gd/english_textbook_for_class_10_ncert.pdfIn PDF document text
    • http://feramivo.rf.gd/microsoft_access_2017_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/java_programming_examples_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/7252732542.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/80584943902.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/84795626051.pdfIn PDF document text
    • http://lunowakaneruf.rf.gd/arctic_ice_sheet_sea_levels.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 5472 bytes
SHA-256: a69f4e098185680212218a9d492db4a2194cea8e93574ae6b918db23fcda344a
font_01_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 10744 bytes
SHA-256: 1b07c10677da72f20f9ae8781bbb6d4cf783af1f089b12e27d23538c50187b29
font_02_sfnt_off00013c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C49 16060 bytes
SHA-256: c79b30b6bd44b50f109e51717429520d8311dc1dd7d649b6a46b8818e03a33a3
font_03_sfnt_off000150da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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