Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59a6ede12854a22…

MALICIOUS

PDF

77.6 KB Created: 2021-03-28 10:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdd7ee5eadbb58f87759f56de81192e0 SHA-1: e26ba9763cea8b29166a9d8c015df8879af1f916 SHA-256: e59a6ede12854a22291fb36c9231b0571105ed7b1ae4f3830248f9ee459f9fa6
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=what+preparations+had+montresor+made+for+his+revenge+in+the+cask+of+amontillado
    • http://xemokajoled.medianewsonline.com/percy_jackson_2_streaming_film_complet_vf.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/how_to_determine_which_solvent_to_use_in_recrystallization.pdf
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/75fa9160.pdf
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/pudumejelavene.pdf
    • https://cdn.sqhk.co/jojikoxazew/gjjhAkr/xukeze.pdf
    • https://dijajogid.weebly.com/uploads/1/3/0/8/130874349/wenuremerudude.pdf
    • https://cdn.sqhk.co/soxesemu/fJzWihA/galaxy_watch_active_2_bands_australia.pdf
    • https://cdn.sqhk.co/xasomegupur/eha95hf/61355213134.pdf
    • http://pejelurim.getenjoyment.net/78832048777.pdf
    • http://baderezu.scienceontheweb.net/how_to_clean_dishwasher_filter_general_electric.pdf
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/libiwena_nilidadubexogow.pdf
    • https://japatuxivavagax.weebly.com/uploads/1/3/0/7/130775167/gedajeje.pdf
    • http://jokojujut.medianewsonline.com/google_search_history_on_iphone_7.pdf
    • http://gamukanemafutu.mywebcommunity.org/zokovowukujoporawekuwupaj.pdf
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/5387562.pdf
    • http://foramodosug.mygamesonline.org/butujumowuzexitemura.pdf
    • https://numesenara.weebly.com/uploads/1/3/1/0/131069843/9983334.pdf
    • http://vipimuxatomefi.medianewsonline.com/38785402232.pdf
    • https://cdn.sqhk.co/bobimugura/ijCMIuU/radajamatag.pdf
    • https://cdn.sqhk.co/fefuxumito/hdK8ifU/92212594958.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zexizel.epizy.com/83929881218.pdf
    • http://jimuxilobu.rf.gd/rakudi.pdf
    • http://dupugozub.epizy.com/klasifikasi_obat_analgesik.pdf
    • http://baniduzi.epizy.com/beethoven_sonata_in_c_minor_op_10_no_1_sheet_music.pdf
    • http://najusibajeful.rf.gd/best_selfie_stick_for_skiing.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_off0000ef29.bin
9ebf33f537d2bc6e3920e1d70299556d1689253a26cf5a9448c42cc2f9eb29dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 5704 bytes
font_01_sfnt_off0001027f.bin
84df983a02d12173a836b2cda855bd9edf19ae70c2649b89e23ba0b3cb2d9859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 10216 bytes

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