Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bb5ab6f41afab3…

MALICIOUS

PDF

75.1 KB Created: 2021-04-24 00:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 88623d07e0b711f73c003a86e41d9638 SHA-1: cb04eab5bc2364d0c5396510509294d818b3ed0a SHA-256: 52bb5ab6f41afab3e1c3750cc999e4accb1da40a5b238b20a89dd18b21b965ed
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing lure or a downloader for further stages. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

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
  • 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://midufefew.ru/strik?utm_term=how+to+teach+character+traits+4th+grade PDF link annotation
    • https://cdn.sqhk.co/fepogosu/hwhdha7/world_war_2_tank_battles_africa.pdfIn PDF document text
    • http://mkr-olimp.info/tagigokigakedajaxizutij2u3k9.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/69777818932.pdfIn PDF document text
    • http://dusosax.66ghz.com/88387310578.pdfIn PDF document text
    • https://cdn.sqhk.co/xesoralo/gfiaBD5/dagesike.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/84702259411.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/Qjb3ijk/20610106460.pdfIn PDF document text
    • http://muzowidepikoz.iblogger.org/18572317784.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/aeneas_vergilius.pdfIn PDF document text
    • http://1freedom.space/bruce_springsteen_agent_contact_informationzsiaf.pdfIn PDF document text
    • http://bidukesures.22web.org/69377268033.pdfIn PDF document text
    • http://contentmedialiteracy.com/trumpet_voluntaryhw0uy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedizokasub.rf.gd/second_conditional_exercises_british_council.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/what_is_zone_3_training.pdfIn PDF document text
    • http://binuwuzipu.myartsonline.com/what_is_categorical_data.pdfIn PDF document text
    • http://jatitubez.epizy.com/audio_visual_aids.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/28766444291.pdfIn PDF document text
    • http://fezibebub.rf.gd/roludowevilaguraru.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/genisadujisudeg.pdfIn PDF document text
    • http://gesovupa.epizy.com/lekuxe.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/thank_you_mr.falker_book.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 5308 bytes
SHA-256: ded0c14f1ff250a74145a4f3a53c9437ce53453fa8ad0f2c7321c7ce7d04d305
font_01_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 10640 bytes
SHA-256: b5454fc9810bf493255de14e087dba385c885087e716f79eb37cd89574438cb2

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