Malicious PDF — malware analysis report

Static analysis result for SHA-256 41191d2747f93cb0…

MALICIOUS

PDF

92.9 KB Created: 2021-04-04 16:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e48c8e8ea2206764cd861ed78a4a7102 SHA-1: aecdbea561b0720d71120e657e2977af70607441 SHA-256: 41191d2747f93cb0936c988c375902120aa07dbd4a48cca5d16b758fdf3febdf
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the PDF heuristics suggest it's designed to lead users to potentially harmful content, possibly a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=how+to+connect+rocketfish+to+receiver PDF link annotation
    • https://cdn.sqhk.co/febapaji/g7CkrWR/gadgets_360_shopping_review.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/f9cb3acd.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/eyNihid/noticias_univision_34_solo_a_las_11_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_6054fed4843f9.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/Lhfp3gi/74093732154.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/ejdhhgj/dale_vida_a_tu_cerebro_descargar_gratis.pdfIn PDF document text
    • https://wejumarokurefa.weebly.com/uploads/1/3/0/7/130776247/furudatur_ritudixeleg.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/7UGhiOD/like_a_boss_movie_review.pdfIn PDF document text
    • https://bewupisobafa.weebly.com/uploads/1/3/5/3/135340617/pejorine-bafedataxiwava.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/hhgkQFP/76785698473.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/ZK7ghaK/84111567353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387919/normal_5ff508d4d1f9c.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/3PiewwL/unbordered_foreign_friend_chat_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/ggiNEsB/free_ringtones_2020_music_ringtones_and_sounds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wibefiwijufet.epizy.com/rixikilegugezigedabiro.pdfIn PDF document text
    • http://pikididubemet.epizy.com/hec_approved_supervisor_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3c4be6-b4f3-4e1c-9f14-3d81ecacd822/polaris_ranger_1000_side_by_side_specs.pdfIn PDF document text
    • http://bejuxufuvojofa.rf.gd/do_metals_or_nonmetals_form_cations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e59975-41ae-4d1d-a86e-287e0cef6772/deziji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ba9291-d5fb-4904-9d17-f4ac14012c74/skyrim_official_game_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a866fa-85f9-41f0-9743-d1d3ab700d23/in_cold_blood_original_book_cover.pdfIn PDF document text
    • http://nomulumipal.rf.gd/how_to_set_up_nutribullet_magic_bullet.pdfIn PDF document text
    • http://totofexux.epizy.com/making_cv_format.pdfIn 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_off00012ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED3 4904 bytes
SHA-256: 6752954b9387293debfe7c78d96c8cd5af0fa049de99ea1e780dad8b62fa1957
font_01_sfnt_off00013f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9E 11368 bytes
SHA-256: b38f46886aef77faf9aeaffc2ed7813e995c7bc6b95ed6b9c2edbb8047ef0d61