Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a07ecd66d814cd…

MALICIOUS

PDF

80.5 KB Created: 2021-05-06 00:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c76ecd8e2ad63a290ad37f0901edee30 SHA-1: 5a734591aac5319c8e016562ce2d6540b6b837be SHA-256: d7a07ecd66d814cdcb547152a99124b6e2800af7da2b10e1391d6394a90b0f06
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=how+to+put+pdf+on+a+kindle PDF link annotation
    • http://sunazeremitiwu.mypressonline.com/cardiomiopata_periparto.pdfIn PDF document text
    • http://xupogete.iblogger.org/what_is_the_meaning_of_effectual_measures.pdfIn PDF document text
    • http://didopikorubozav.iblogger.org/dorejuwifelizikuxokoraki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witesenigo.atwebpages.com/la_armadura_de_dios_para_nios_actividades.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/2030941092.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/47760028873.pdfIn PDF document text
    • http://ladisopezaxak.epizy.com/free_avg_antivirus_for_android_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/cloudformation_codepipeline_template.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_8ad62061137946bdb853c939d957571d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/rcmp_criminal_record_check_form_bc.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/26033401411.pdfIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_3127f37851014711a9acdf03c8f7e52e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f0261a-33b4-463d-b4de-e4ce15655c70/forged_in_fire_show_host.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/15817091284.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/gotta_go_my_own_way_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecf40d3-bcd0-43c5-8bf7-4ba3c030d21b/metal_gear_solid_4_ps4_gameplay.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/vafawixij.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/vitamin_b12_deficiency_anaemia.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/private_trust_deed_format.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/algebra_1_chapter_3_solving_inequalities_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a30e05-7523-40d4-b014-b467f4f8ef28/tiguvime.pdfIn PDF document text
    • http://posikin.myartsonline.com/niccol_ammaniti_anna_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/watch_less_than_zero_movie_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0170f591-61bf-405b-82ca-2767d98bec8b/kotolivabukejo.pdfIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_5662bd62bf484abca2bdc972abb40763.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_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 4876 bytes
SHA-256: 21e2f48707a47289f707493fe24b22ea3064daa2f4d3d2ce3e947e92acdc4ffa
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 11008 bytes
SHA-256: abf8de36d1b456415cc16aad3028609446a6f4d3f6e4f7361fe7008c08b2c0f3
font_02_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 16476 bytes
SHA-256: cb6f25a6fe25280ddf9e0a02baa93a5d2fbdfcbf15c5aec9fa988a3fdaed3b97