Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cb999d1a010546…

MALICIOUS

PDF

67.1 KB Created: 2021-03-21 22:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d23b607fe901e88fd0f128f236e8cd56 SHA-1: 29ab83f721a57d992526a020092950164ca2fa88 SHA-256: 80cb999d1a0105460ff3d4309a4ee43225f7fe126748c47f36edab3db203d42b
194 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 hosted on disposable domains, suggesting a link farm designed to drive traffic or distribute malicious content. The presence of a 'download' button lure further supports a malicious intent. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://gimoguvi.ru/wix?keyword=avatar+the+promise+pdf+download PDF link annotation
    • https://cdn.sqhk.co/wiwokosokif/dghZY2O/christmas_sunday_school_lessons.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/list_of_valid_categorical_syllogismsoi5rl.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/eqgfUj6/planetary_model_ernest_rutherford.pdfIn PDF document text
    • http://ridunculus.com/478138183329iacf.pdfIn PDF document text
    • https://cdn.sqhk.co/kixikeli/i8uhcy5/50902445041.pdfIn PDF document text
    • http://vodabezoli.iblogger.org/gijutisisewaneduta.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/iHvU3lS/hero_rescue_dogs.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/washington_state_university_ranking_world.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/guia_turismo_pais_vasco.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/Rihgikv/dewapogig.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/3238502764.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/e7f97ad3-2618-4a04-a097-4e5a4c89e3f8/xerox_7845_waste_toner_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d21bb5b-212c-400e-b2a9-0e7a7a181df8/what_is_the_healthiest_at_taco_bell.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_27a6d9c61edc46769564990cc1a10c16.pdf?index=trueIn PDF document text
    • http://pulupalu.epizy.com/ben_10_games_apkpure.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_de9dae14fe554cfb8180e9f4198b17e0.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CD 5420 bytes
SHA-256: 0dd70a4e3bf256ebcd782c1fd98459fe23bd01d3eb1f60d69465e1d5cd37209a
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 11756 bytes
SHA-256: 1052d0b40052bb84fcca61c36f82c09b2905ef56ddf6c9ede53abe27d5511eeb

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