Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3771ad65eba9fa…

MALICIOUS

PDF

112.4 KB Created: 2021-03-09 07:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 69d8d4799758df7846d26d2467b9c8ff SHA-1: 00b4c4270195d7b6b0d2360471f5c4270047de0e SHA-256: 1d3771ad65eba9fa2fafec468cec37900da27865685dcfca74f820ad7ba4147b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://vilenefex.ru/123?utm_term=weekly+schedule+template+for+students PDF link annotation
    • http://depusapo.mypressonline.com/58583149968.pdfIn PDF document text
    • http://storefromit.pro/procedimiento_analitico_contabilidadhhcl7.pdfIn PDF document text
    • http://reduslim-europa.site/sky_fighters_3d_hack_apk_free_downloadic5oy.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/jghQzha/loudest_ringtone_free_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/cjgnja3/printable_relief_wood_carving_patterns_for_beginners.pdfIn PDF document text
    • https://noxiwufozale.weebly.com/uploads/1/3/0/8/130814513/tonosegosimodokozul.pdfIn PDF document text
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/nuwivagamipo.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/what_is_the_subject_of_the_poem_the_raven.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/aswb_practice_exam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muzulozak.atwebpages.com/capital_market_line_is_firstly_initiated_by.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/artists_way_julia_cameron.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/ben_ten_alien_force_vilgax_attack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/what_do_i_need_to_renew_my_cdl_license_in_illinois.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/genikufovev.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/gym_membership_forms_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/chit_chatting_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/arteriovenous_malformation_in_uterus.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/xisipajop.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_off00017d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D6D 5576 bytes
SHA-256: b9461e50b37e180b8366a12377aa05c3279ef9cb20299ec5541f94800afdef11
font_01_sfnt_off00019053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19053 10580 bytes
SHA-256: 2027ce92828a1cc4ef22c3e9bf02ebf861279dbe406a21af332803a23dad28e0

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