Malicious PDF — malware analysis report

Static analysis result for SHA-256 307ff210ec36483a…

MALICIOUS

PDF

74.2 KB Created: 2021-04-24 15:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b78be72ea6de628ecf5726aeb1f02524 SHA-1: e74d1c146e708593c43b7c289918533b8a6aa28a SHA-256: 307ff210ec36483a6e855cdbb1c01be7ef327bae494274934805c8fc0f2ab0ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body and embedded URLs suggest a phishing or scam attempt, masquerading as an educational resource to trick users into visiting malicious links. The presence of numerous external URIs, many on disposable hosting, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=spoken+english+grammar+pdf+in+urdu
    • https://wevejabunom.weebly.com/uploads/1/3/1/4/131406075/tabisus.pdf
    • http://ritual-venki.online/missing_number_worksheets_free23ect.pdf
    • http://covid-19online.site/essentials_of_chemical_reaction_engineering_solution_manual74rfz.pdf
    • http://penaleduduzib.iblogger.org/jarisironowapejejukajaki.pdf
    • https://jutamuxenaritul.weebly.com/uploads/1/3/1/4/131452982/166113.pdf
    • http://normaa-id.com/will_there_be_a_wings_of_fire_graphic_novel_56tiwj.pdf
    • http://domavera.ru/zuperq2qj5.pdf
    • http://jopkapopka.online/tejinakudipazgid39.pdf
    • http://bigowet.xyz/zodoguxopevadotulevilabidldm85.pdf
    • http://itgermany.net/nelafujasu3vv8l.pdf
    • http://francobusiness.com/zidomapunimesebib6sdo9.pdf
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/kisoliranolurux-fewofoka-jarelan.pdf
    • http://2020coupons.info/xonefulokamowezinambqhel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xenilesaripesu.epizy.com/iphone_audiobook_not_ing.pdf
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_35b11814808a47569c91044cb82ab126.pdf?index=true
    • http://gixuzunafijid.epizy.com/95784320929.pdf
    • https://uploads.strikinglycdn.com/files/47a0fb08-e180-46b8-840a-22d6ed2ecf27/how_much_is_a_subscription_to_the_new_yorker.pdf
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_0b35c62dcb00449780b55acd463643dd.pdf?index=true
    • http://nasujaguza.epizy.com/19750009871.pdf
    • http://xulivef.rf.gd/free_kindle_app_for_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/44135da6-282a-4698-a167-26915278564b/85590861150.pdf
    • https://uploads.strikinglycdn.com/files/01db1b96-6b7a-4933-a191-6594d33fa3ec/74193061966.pdf
    • https://uploads.strikinglycdn.com/files/b03ba6ce-22c6-4565-a064-7b8b79d15e3a/what_is_industrial_robot_control_system.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e253.bin
d29c715314cc7c0101d7057c0f49fa085cdfe7cc7db32028d45d2a614a6ae6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 5620 bytes
font_01_sfnt_off0000f547.bin
4f483b012559dc568ba845c016c6ac98f180acb3367695d4c797d179344681d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 10624 bytes

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