Malicious PDF — malware analysis report

Static analysis result for SHA-256 194fffd4242c5f3a…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 07:09:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 80eb0dcc9fbe5ad123ad02dcd012dd45 SHA-1: 1038ef98e5ee855f3af3a900554c1ef7e72b76a0 SHA-256: 194fffd4242c5f3a3cdaf22577b3e648b7ac51cb3590c01d07899fc76b4e5ef5
194 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 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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/award?keyword=converting+kindle+to+pdf PDF link annotation
    • https://cdn.sqhk.co/guzorata/ca8geNr/legendary_prison_escapes.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/jeiegcJ/lexonalewinuwipifurerutom.pdfIn PDF document text
    • https://cdn.sqhk.co/kapudome/S4gg8wT/riluziwezedosebimogifo.pdfIn PDF document text
    • https://cdn.sqhk.co/nafadilinozo/lLxibzC/xejutadazakadufirar.pdfIn PDF document text
    • http://rixanemusijod.mywebcommunity.org/sekemubusadeseget.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/hdicsgh/egglettes_hard_boiled_egg_maker_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/hhLgcja/horizon_fcu_routing_number.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/lilizojadaxijife.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/dupidopafurexido.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/jubidi.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/8353262278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kotazok.epizy.com/bubolarelagosubafos.pdfIn PDF document text
    • http://safubifulaxoxe.rf.gd/best_rigs_for_saltwater_pier_fishing.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_477ee044b1024ca9925dc79b442552ee.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_8baf9f9841ed41c2981bf4f6c6b8c3fd.pdf?index=trueIn PDF document text
    • http://xumugipetoje.epizy.com/wavelet_transform_feature_extraction_python.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_fc3293c1f7244e89810a04bc44132099.pdf?index=trueIn PDF document text
    • http://romisov.epizy.com/32606540822.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/78395765448.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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 4848 bytes
SHA-256: 83c1e07e01349f3225ea34971768863af9de9a43b6fc63c08d344627ae4a5e69
font_01_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 10840 bytes
SHA-256: c713e476840b8b8f28961182c19789047643a45c89bfbbeb33d73521f37bc2be

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