Malicious PDF — malware analysis report

Static analysis result for SHA-256 55809f778908d901…

MALICIOUS

PDF

77.4 KB Created: 2021-03-06 00:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f0b9ab597a5b7f30f7b77d17d69c2600 SHA-1: 5fffe5055953359d06a18c9c8280c1a0dd960156 SHA-256: 55809f778908d9013f47e89af2aeddd584ff73a3613c96a3dcf34828e4de78c5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO manipulation scheme. One of the embedded URIs, 'https://jottigo.ru/wix?keyword=faces+on+text+message+iphone', is flagged as unknown reputation, while others are marked as benign, but the overall structure and detection results point towards a malicious purpose, possibly to distribute further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://jottigo.ru/wix?keyword=faces+on+text+message+iphone PDF link annotation
    • http://lelekelosutov.getenjoyment.net/camila_cabello_matthew_hussey_dating_timeline.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/1833039887.pdfIn PDF document text
    • https://cdn.sqhk.co/jabupexipa/hd5jgSr/silicon_valley_power_santa_clara.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/32989088963.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/which_of_the_following_is_not_true_regarding_a_project_management_communication_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/iehdjjI/origami_owl_bracelet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/38348348893.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_b05ffe1b3bfa40c29998cc5cb3ee34a1.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_79bd8be3720d4dddbd96ac08c42a0fc2.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_563c3e61c3474fcda76ac8733304b4f6.pdf?index=trueIn PDF document text
    • http://xenezipulugiji.atwebpages.com/practice_english_speaking_online_app.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_4a4595419943407aaf8bd77dbc23e02a.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_c09da70281f548759a5bb879126b4ed8.pdf?index=trueIn PDF document text
    • http://nokejufesuw.atwebpages.com/dabezebe.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/how_to_replace_heating_element_in_ge_spectra_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/gezoladafutuduk.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_dc441094e0e84b51a5fcf06b92dbf02f.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_465311281c67449199af2f9d3df275b6.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_c56bde6329124d3ead1502e35c307b59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/solidworks_2019_tutorial_planchard.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_28c6f1ebfbf84068aaa719caae5601fc.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_7dcdbf02bf904f3ab099180a2b67d595.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_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 5244 bytes
SHA-256: 1d786dcbf5bf68c955edebfd282fbce994d2f0d856a29f91f2b08973f86246f3
font_01_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10396 bytes
SHA-256: cc9b8409b4cde987f42ac47f37675e350dba6d8f194cb503f081895d96ce7fba

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