Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f8d77383110539…

MALICIOUS

PDF

76.5 KB Created: 2021-03-27 11:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 479d3325d208d42eb283961452043b2a SHA-1: dc32f35369f103ea894656184bacd903f804a51d SHA-256: 57f8d7738311053967f5af89410a4e20c88339c3d8d54aaa4dcb149e21275b83
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this, as they likely redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=hans+wehr+app PDF link annotation
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/8043121.pdfIn PDF document text
    • https://fadurobudafeme.weebly.com/uploads/1/3/5/9/135959894/gajowozutakimigi.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/bartlett_s_test_of_sphericity.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/41090595807.pdfIn PDF document text
    • http://dagulofevururuk.22web.org/bivetufaga.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/taco_bell_power_bowl_calories_without_sour_cream.pdfIn PDF document text
    • http://pakizimavom.scienceontheweb.net/talk_like_ted_carmine_gallo.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/tofipikukexemunuvinugo.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/65003292479.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/how_to_use_the_mini_keurig.pdfIn PDF document text
    • https://jeripakituwimug.weebly.com/uploads/1/3/2/6/132695489/2311261.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/monitoring_and_evaluation_plan_sample.pdfIn PDF document text
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/wirigegixixorin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bosurigazo.epizy.com/wepuso.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/filezilla_ftp_server.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79afe258-349f-4e59-bd44-f4aa60bd3932/huckleberry_finn_sparknotes_chapter_11.pdfIn PDF document text
    • http://jelameb.rf.gd/sultans_of_swing_lyrics.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/39054536523.pdfIn PDF document text
    • http://dizibabazuvuxu.rf.gd/2632632933.pdfIn PDF document text
    • http://bosirizowu.rf.gd/modern_engine_blueprinting_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4200f6f1-a87b-47e2-b56c-f703bebce20b/32597032115.pdfIn PDF document text
    • http://xifeloj.onlinewebshop.net/lawenigawevilidi.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/grounding_techniques_for_anxiety_attacks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43dc482-4716-4775-be53-0666c7520395/nujimadosudi.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/jurassic_world_the_game_mod_apk_rexdl.pdfIn PDF document text
    • https://itunes.apple.com/us/app/arabic-almanac/id1036801850In 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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 4928 bytes
SHA-256: 78a52eff2220a207a3b8d5ec8bbedc1df3c07299a23084073a9b5992fcc647c2
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 10392 bytes
SHA-256: a0c3dc63d59e7d52a8c14ed6f4d13a7dfa0b5f7ccd215705aea72102686524ba

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