Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25ed49d918accd6…

MALICIOUS

PDF

79.3 KB Created: 2021-03-28 11:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4476681f6c53891960a089a1e8aeef78 SHA-1: c53d9be4543d8a892c78f33d2ff757332b227c26 SHA-256: c25ed49d918accd64b605646e5c6be0be171357255b88acc93d038be19070300
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious or deceptive content.

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://fokemale.ru/wb?keyword=am%20k%C3%BCrzeren%20ende%20der%20sonnenallee%20film%20buch%20vergleich PDF link annotation
    • https://cdn.sqhk.co/kutajanode/Rghibia/affirmed_housing_san_jose.pdfIn PDF document text
    • http://tugrull.com/gesajimejuvanewigolokexej2p89a.pdfIn PDF document text
    • http://titanof-filtr.ru/cmo_ganar_amigos_e_influir_en_las_personas_audiolibrogvtgh.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/u8hdMTx/dent_de_lait_qui_tombe_a_4_ans.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_6008a5f621385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_603bf4322f1ad.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/inLughX/84879713686.pdfIn PDF document text
    • http://sodalabs.club/resumen_del_libro_un_secreto_en_mi_colegio_completoouo8w.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/GAghESK/europe_front_2.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/jFhhcie/dino_safari_2_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_8db728274e494fc7862383f10cfb3f15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2598a466-7215-41f3-8b07-ed7b1a7ee941/meade_etx-80at-tc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb78426-3b5b-4612-a7f7-1ef1f13e8abd/gulolukibosepikufogak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5c1651-a56a-4aeb-abdf-c5370c6ba43b/70935356758.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_b0daae031dc74295b4af9c1d6be2b593.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_6e7458dddd324d4ab42b36fb1bfd8ec7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a517751-8b0e-4d4f-a0b1-29b2710a4a07/do_changelings_have_darkvision_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144e5b32-1658-48e7-8a0b-77ee4a512d0c/art_in_focus_student_edition.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_6d050e1538ca42179b64b45a7bfe9fbc.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_48ebd548f316478e998daab8f7c6d326.pdf?index=trueIn 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_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 5856 bytes
SHA-256: c952c5547a48a50ceb85b03eb60a43d34438231fce24129a03c579aabeaa1bc9
font_01_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 12288 bytes
SHA-256: 12418c7dc4ab57a95cd0c3ad8673d3b936f3f6aeaddb859bd7fe2d576f6d358b