Malicious PDF — malware analysis report

Static analysis result for SHA-256 625091e5ee6f6193…

MALICIOUS

PDF

76.0 KB Created: 2021-03-31 22:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 064c1573f15ca6a5b48f7bfa6a100b72 SHA-1: f01d19b5b8f6e72193b2d0fb92d679b1a395dca6 SHA-256: 625091e5ee6f619341ad7b848d675cbc11ff3cd9a6627b29d931cb7e253814e7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing browser extensions or updates. While no scripts were directly extracted, the embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jacksth.ru/123?utm_term=adblock+plus++google+chrome PDF link annotation
    • http://wwwbcpzonasegura-viabcp.com/jelly_belly_flavor_guide_printablemj9fw.pdfIn PDF document text
    • http://helpforteam.com/ortega_taco_seasoning_mix_instructions0g37x.pdfIn PDF document text
    • http://lifesodupix.22web.org/the_merry_adventures_of_robin_hood_analysis.pdfIn PDF document text
    • http://damita.fun/josaxwxfec.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/6329f2895.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/mivuxu.pdfIn PDF document text
    • http://health2health.online/pulibawaganubutujikit8s45b.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/webilepedulemim-rejif-wotawa.pdfIn PDF document text
    • https://junenewawaxi.weebly.com/uploads/1/3/1/4/131407408/1457e7f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_602489d985fcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_5fea45b6c3246.pdfIn PDF document text
    • http://remontlegko.info/279375930684bjnp.pdfIn PDF document text
    • http://mubarominufu.iblogger.org/how_to_write_the_aim_of_a_research_paper.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/36f2c1e4-16bc-4f6c-9714-b1b5a977f779/can_a_pressure_washer_pump_be_repaired.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_3f6ec51318a045c88c271f89007b2a31.pdf?index=trueIn PDF document text
    • http://jobagivojik.rf.gd/accs_icloud_depuis_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a43c7f-90d7-49b2-a8ca-2e7f838ab800/a_series_of_unfortunate_events_book_1_chapter_summaries.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_254affaf52cd4eeda4ef047166f574f9.pdf?index=trueIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_c93c5479799e4ceabd34d5611efd461c.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_5b899504c7884ee89c46fa90e0d58071.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/680bd696-804d-4d03-a788-b2a0991e99d4/what_does_the_color_green_say_about_your_personality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c716958b-8e02-411f-a346-327bfad012dc/installing_hp_officejet_4500_wireless_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9a03aa-a19a-4b46-bfa8-246f5dcfeb47/sogozofegevuromorosuru.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_edeeabd30a7647a0a6a53479bee11d77.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_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 5468 bytes
SHA-256: 4d9dac4b9493ac80a25d2bdbfc5a4967cd2573cd3dc4490536944000ba175e38
font_01_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 10720 bytes
SHA-256: 3804c3591a30e437cb280db9362591e8fae25d17a94393a7601ca680a7fb8fa3

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