Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a3759d5201d1de…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 23:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 997c86fbaf1538b3e1cf46e0ec177597 SHA-1: 287177aa405bcb77b095a7bffa501a246ee9c678 SHA-256: d0a3759d5201d1de3ebef0192498e70c48082a9670b446c1f22504ec29b54d4d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=dt466+turbo+on+7.3+powerstroke
    • https://cdn.sqhk.co/dasupejej/eQhjpid/gagireweregubakuwekasuk.pdf
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/6814632.pdf
    • https://cdn.sqhk.co/masamiwe/gBjcjcJ/halloweentown_high_cast.pdf
    • https://cdn.sqhk.co/xawobovuji/gJigjhC/radiant_cut_diamond_drop_earrings.pdf
    • https://salubekera.weebly.com/uploads/1/3/2/7/132740515/zoxugogamevesez.pdf
    • https://cdn.sqhk.co/gutifusuf/bgiaFhi/magic_portals_apk.pdf
    • http://gamukanemafutu.mywebcommunity.org/earth_charter_document.pdf
    • http://tezibif.mygamesonline.org/play_10_guitar_songs_with_3_easy_chords.pdf
    • http://kojazunupetip.mygamesonline.org/loverubazugilozuda.pdf
    • http://gejudoxe.mypressonline.com/what_percentage_of_cocoa_is_in_dove_dark_chocolate.pdf
    • https://cdn.sqhk.co/kolokejo/ZdNjhW1/sea_captain_2017_mod_apk.pdf
    • https://radotarurejatu.weebly.com/uploads/1/3/1/6/131607565/bevobinokubikudova.pdf
    • http://fekevopimibun.sportsontheweb.net/finders_keepers_creations_reviews.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://majuditatip.rf.gd/31908351870.pdf
    • http://risetozo.epizy.com/fs113_dairy_products_crossword_answers.pdf
    • http://biforobajimebug.epizy.com/sugobanowa.pdf
    • http://megigezorozo.atwebpages.com/silujuzulopopulib.pdf
    • http://rorazizaxaf.atwebpages.com/hosanna_marcos_barrientos_lyrics.pdf
    • http://fasasipapuzu.rf.gd/fufuguzokajezabosumigo.pdf
    • http://gadivedu.rf.gd/developmental_milestones_of_a_7_month_old_baby.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_off0000ec2b.bin
9c274fd06197c7524ffde4377cfc42cfa8b0b406f9083525e8cd2cb72d93c227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 5384 bytes
font_01_sfnt_off0000feb7.bin
b2ce4c3b19b24f39fd87c2550d69611c9ff7e29de205d950ee750700cfcb88d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 11072 bytes

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