Malicious PDF — malware analysis report

Static analysis result for SHA-256 419b0169babc2514…

MALICIOUS

PDF

89.3 KB Created: 2021-03-25 08:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06614dc6cc892bea602948f2a519b17f SHA-1: 839d3bbeb9ac84fd5c2a49867c97914b54718190 SHA-256: 419b0169babc25146f0731c4fd88e522ee8a6e5baaa3b20bf5540fc2eb3257e9
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/wix?keyword=university+of+delaware+star+campus+map', are designed to lead users to potentially harmful websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=university+of+delaware+star+campus+map In PDF document text
    • https://cdn.sqhk.co/nudogada/jajereR/mosquito_sound_effect_mp3.pdfIn PDF document text
    • http://xazutakivad.iblogger.org/kitchenaid_mixer_repair_calgary.pdfIn PDF document text
    • http://gubokiwurajot.iblogger.org/samsung_galaxy_s5_active_price_in_kenya.pdfIn PDF document text
    • http://vivofuma.66ghz.com/minijijefisirobemirage.pdfIn PDF document text
    • https://cdn.sqhk.co/lowixadoges/xNgghjz/miminozugixiza.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/c6T7hgl/flat_world_map_minecraft_download.pdfIn PDF document text
    • http://cuzinfo.ru/are_electric_toothbrushes_harmfulen9cz.pdfIn PDF document text
    • http://lighterusb24.site/wijawutilikukemobdclq3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lodusebivepakef.epizy.com/mesereminaseduwor.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_980e0a3ff42c4b5dab92e80882bb3c09.pdf?index=trueIn PDF document text
    • http://vajexakatozezal.epizy.com/51011864326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6843bf-3ecd-40f3-8a6d-540c09271432/wenupajosajoruxokanil.pdfIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_12a5c528870f4feeb534508cb12df692.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c027920-8e6c-48c7-9eca-27190caebda3/simulacro_de_evacuacion_2019_costa_rica.pdfIn PDF document text
    • http://rorujuzolu.epizy.com/hd_movies_apk._in.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 5428 bytes
SHA-256: 7867a9ea1547ffbe46a1a450d2ab17b4db92040305e6b2af5cb10d98f06b0d7c
font_01_sfnt_off000124c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 10912 bytes
SHA-256: df698ab694a3ecc3e3bb45954d2dcebeb416c3f143e60d1aa2dd2ea95d173b16
font_02_sfnt_off00014a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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