Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb9df561a469a60…

MALICIOUS

PDF

83.7 KB Created: 2021-04-08 17:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 137210ad53c15df3866f4561a7d5af62 SHA-1: 1195e16b2159aabd2fca8042688cac83892f5c3d SHA-256: 2fb9df561a469a60248f39016f5916963bd58cd8ba0135429c9581429797b5b1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed for SEO manipulation. The primary malicious URLs identified are 'https://kuzutuzo.ru/strik?utm_term=does+romeo+kill+mercutio' and 'http://lowufadit.scienceontheweb.net/94939894528.pdf'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized document.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=does+romeo+kill+mercutio
    • http://lowufadit.scienceontheweb.net/94939894528.pdf
    • https://cdn.sqhk.co/ruxukulalodi/hfibwia/20750152963.pdf
    • http://pojapusevipuzu.mypressonline.com/how_to_do_cool_dance_moves_step_by_step.pdf
    • https://cdn.sqhk.co/zidexamuwela/cggjhW4/36107931137.pdf
    • https://cdn.sqhk.co/zogameva/LieiRhg/free_dating_sites_mexico.pdf
    • http://dedaruk.scienceontheweb.net/41445162731.pdf
    • http://moradudipomibo.mypressonline.com/conjugaison_etre_et_avoir_a_tous_les_temps.pdf
    • https://cdn.sqhk.co/metexemoraga/3gfOVKy/mars_square_mars_synastry_tumblr.pdf
    • http://kopuvimu.scienceontheweb.net/ronusutaxisi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_d1512d6dd50a40c9b82f7728b24746be.pdf?index=true
    • https://s3.amazonaws.com/wupagivoz/the_fundamentals_of_drawing_portraits_a_practical_and_inspirational_course.pdf
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_6cc7e28caeed40219b3d56594ae4cb02.pdf?index=true
    • https://16dc6c2a-32e3-4a69-9eea-5b59d93654f8.filesusr.com/ugd/176c29_14d60f5357c346f99c1b1bcc550e1b34.pdf?index=true
    • https://s3.amazonaws.com/vekodupiwarobi/whats_tracker_app_apk.pdf
    • http://tediguku.atwebpages.com/vufikesapadopaxatukapo.pdf
    • https://s3.amazonaws.com/zebarufuridorur/ottoman_empire_worksheet.pdf
    • https://s3.amazonaws.com/lixisariwulo/32831893761.pdf
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_5f91c1be73d04e0895101c5c421d7c65.pdf?index=true
    • 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_off00010d71.bin
5ed443cd9563ed251afe2e1dad681adb8896252a5330a08fed9e1e2fa38f2b86
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 4800 bytes
font_01_sfnt_off00011db7.bin
75aa0509b92fbcce4fe664fca4e5da79f08afdcc37bafce998978003c7a2d085
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 10636 bytes