Malicious PDF — malware analysis report

Static analysis result for SHA-256 5253cbb173c53632…

MALICIOUS

PDF

78.1 KB Created: 2021-03-23 01:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a87cc12507d00e4a03b9db6cd60ec291 SHA-1: aa388dd8e666b0951fac36802ecee004d18f07d9 SHA-256: 5253cbb173c53632343dfa2cc7d84de8ea332c65a2c02048b5265d80bf91c379
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to scientific protocols, likely used to deceive users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/123?utm_term=phenol+chloroform+dna+extraction+protocol+from+tissue PDF link annotation
    • http://kiluniv.22web.org/bikagadogeteralavurojub.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/resujedeweda.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/duwenipunokonag.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/how_to_cook_in_a_combi_microwave.pdfIn PDF document text
    • http://raisinshub.club/7888789745q2srr.pdfIn PDF document text
    • http://ropufogesuzazeg.iblogger.org/atpl_flight_planning_sheet.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/temizisozufeneno.pdfIn PDF document text
    • https://cdn.sqhk.co/jozunufap/hgjdifA/teachers_unions_covid_demands.pdfIn PDF document text
    • http://fumigatoff.online/cubase_5_free_download_fullyejmu.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/intercessory_prayer_bible_verses.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/15851809158.pdfIn PDF document text
    • http://levantemosaic.com/pofedefewokurimx5ws0.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/bihjfjg/dents_de_lait_qui_tombent_quel_age.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/hfPwjhN/57347961842.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/ihWhdu0/xokavuletifidigu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pizowaxe.rf.gd/40912987673.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/la_belle_au_bois_dormant_grimm.pdfIn PDF document text
    • http://nelipofamarul.epizy.com/76661381819.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/18342918461.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/hands_shaking_vector.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/alto_and_tenor_sax_duets.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/deputy_executive_director_for_strategic_messaging.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/49597011853.pdfIn PDF document text
    • http://babotos.epizy.com/suzuki_carry_van_workshop_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 5464 bytes
SHA-256: e7cfdede0e114970c4d8615df0723d8407df4de821fbb241a346d93480296a26
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 11536 bytes
SHA-256: d9f187f2387ee012e1b25180f216f5113bfc6e35c441dc0871595e5176b37b7d

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