Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed63f48a805529d…

MALICIOUS

PDF

74.1 KB Created: 2021-03-29 13:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e52168fe0e789db96c676487fe258640 SHA-1: 9488a337912c241e21437f852f5e63a1887857f7 SHA-256: 4ed63f48a805529dce755543a3176ba15bfdb0e8e2422a4d2feac7502da8f0ce
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be SEO manipulation or distributing potentially malicious content through these numerous links. While no scripts were explicitly extracted, the heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection indicate a high likelihood of malicious intent, possibly involving embedded exploits or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://pelibifir.ru/award?keyword=steel+casting+defects+pdf PDF link annotation
    • https://cdn.sqhk.co/fotutubujuf/aBuKpld/best_craft_furniture_wisconsin.pdfIn PDF document text
    • https://rigupanikoma.weebly.com/uploads/1/3/5/2/135297472/c90cff.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/rujojubusiba_tefiguz_rafew_xigitim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_6045141169cf1.pdfIn PDF document text
    • https://cdn.sqhk.co/kobamebexog/A2jgbgc/like_a_boss_movie_2020_online_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427529/normal_5ffccdd0a2835.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/lomotefixuvutaj.pdfIn PDF document text
    • https://seniwotod.weebly.com/uploads/1/3/5/3/135346371/497151.pdfIn PDF document text
    • https://bovidekomuburo.weebly.com/uploads/1/3/5/3/135312485/7693490d0cfc268.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/2ijVjdY/knock_off_meaning_in_american_english.pdfIn PDF document text
    • http://site-shop.xyz/best_sheets_for_hot_sleepers_targetew33f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456666/normal_5fe3c92688155.pdfIn PDF document text
    • http://gayerkan.com/39344779162x22uj.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/igPih0z/word_search_answer_key_app.pdfIn PDF document text
    • https://wawomageton.weebly.com/uploads/1/3/4/5/134584849/vezefizufatibo.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/xawewasibolisoto.pdfIn PDF document text
    • http://instup.xyz/707544579743gi6t.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/ifbRjjZ/werewolf_online_mod_see_all_roles.pdfIn PDF document text
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/femixukapinatat-pafenoju-nozilikaner-naxedipabowel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 5332 bytes
SHA-256: e6fd54867373d12abe11e9554f6ae96ad3641b1d85765926f8200349c291372c
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 9784 bytes
SHA-256: a6130100d47ec62b90fdfcceeb15537ea4506e0ed85ec25996cdbba6ab91e8b1