Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc22a3eb829858a9…

MALICIOUS

PDF

87.3 KB Created: 2021-02-22 17:32:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 13de55d58c67a8ca78eed3e96810c406 SHA-1: 8eda0a6a2de0078571cbe3d1ed5068448d4093d6 SHA-256: fc22a3eb829858a95fad2f058bc9e845b73c648b76815029c200b0439eedac04
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/123?utm_term=is+onenote+free+for+ipad PDF link annotation
    • http://parrrtner.xyz/jivumalutovodolarikel2j5j.pdfIn PDF document text
    • http://beliyden.xyz/metodo_de_tanteo_ejercicios7etln.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/isEhfkX/gospel_songs_mixtape_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/6is8Cjq/xarenobalibozejalani.pdfIn PDF document text
    • https://fojakejozu.weebly.com/uploads/1/3/2/7/132712415/b31c006bf68df23.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/sgiKdif/71241907932.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/fjgheha/colors_of_the_rainbow_song_pocahontas.pdfIn PDF document text
    • https://cdn.sqhk.co/kapokosop/cLRSggX/kujekufe.pdfIn PDF document text
    • https://cdn.sqhk.co/jebanufebejo/gojgig7/93685152343.pdfIn PDF document text
    • http://datab.vip/pafabap9uav.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/9bf2707.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/giidlgh/visa_photo_tool_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/lluJigh/best_cookie_maker_fantasy_match_3_puzzle_pieces.pdfIn PDF document text
    • http://momentshop.space/debajevenarogesetk9357.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/518350bd8.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/hjg4tif/t_mobile_classic_ringtone_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 4728 bytes
SHA-256: ae05b2d504e0aae8139062a5c4ddb69e9764d0025181b070e73bafcb51c0008b
font_02_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10072 bytes
SHA-256: 2093eaea7127b5cf4ac1dbf2a2fe43c3be34e51d95e60455b8c4c44cff5e2d1e
font_03_sfnt_off00012b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B36 16400 bytes
SHA-256: b4fb25211f7873671f67ca644befa4263b72588ac2def8d92ccee27433b89c76
font_04_sfnt_off00014142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14142 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3