Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ac2db3ddd67e8e…

MALICIOUS

PDF

70.3 KB Created: 2021-06-03 08:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5d15770509fd2edda3530488b737438e SHA-1: 2092e7fb297b7c3d52dd19024850c9a9539583e5 SHA-256: 78ac2db3ddd67e8e8558bd3afc47b1b02193111226fbfbf260239e6ea3bb9be2
186 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 0.9996

Heuristics 6

  • 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.
  • 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://resalured.ru/123?utm_term=smoothie+recipes+healthy+pdf PDF link annotation
    • https://dikafusit.weebly.com/uploads/1/3/5/3/135304370/senikatenovanenuji.pdfIn PDF document text
    • https://jowiroluka.weebly.com/uploads/1/3/4/3/134336896/ximiwixu_giwofakej.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/81b5d.pdfIn PDF document text
    • https://sufosuzupunu.weebly.com/uploads/1/3/1/3/131379650/xeriza-kotigod-gegokid-sotuzuxi.pdfIn PDF document text
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/lidopoz.pdfIn PDF document text
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/ec8e24741e8.pdfIn PDF document text
    • https://tolisopedigaw.weebly.com/uploads/1/3/4/7/134708633/galulonof.pdfIn PDF document text
    • https://gakuwalexutibok.weebly.com/uploads/1/3/4/3/134332976/294182.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/4636b57a59f119b.pdfIn PDF document text
    • https://runogobikekeg.weebly.com/uploads/1/3/5/3/135350887/6984587.pdfIn PDF document text
    • https://kizegugiruliti.weebly.com/uploads/1/3/4/7/134729255/kivegov-zarezuwofaxe-paderax-nidupawululakin.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/c66c28e1.pdfIn PDF document text
    • https://razijidepafex.weebly.com/uploads/1/3/4/8/134891772/832367d6967.pdfIn PDF document text
    • https://nopubileluzozu.weebly.com/uploads/1/3/5/3/135389839/rujito_povejajulonejir_tubopakema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6070d3f-3aa6-4035-89ec-1c131552709a/competencias_basicas_para_la_vida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3750293b-7192-4601-b2b4-89b3ce9a6270/sidusirusafukedot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77a7702-516c-404a-88a0-9dccf1f7fd5c/burning_wheel_gold_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120c2e15-df94-4c04-95d4-7c01bacfd999/17248769619.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144548229/samsung_tv_cablevision_remote_control_code.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144522102/14718795091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3055baa3-adfe-4656-83d3-cd87821f1ece/can_cortisone_shot_cause_face_flushing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d580b4-8e48-4642-a560-62d5cb8b4615/basic_rules_of_english_grammar_book_free_download.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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 5600 bytes
SHA-256: 73b859f0daf179d5ec1ffdd3e554c72cd282ef0868ba3f3248e6eab956e42927
font_01_sfnt_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 10220 bytes
SHA-256: b4a8ffaef8cbb7188ca81f6e1e5d277f501a643d7f3a290ada31a822521e9b5a