Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c6630b8a85f30a…

MALICIOUS

PDF

78.8 KB Created: 2021-04-12 08:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1cf4572fca5b46113435fd8fdce5e5d1 SHA-1: 7cc27b827898a9d6d5d19adc52a742fb1f48e966 SHA-256: a8c6630b8a85f30a3242d0f528a09c94a470b05172d475d86b8c7a007403189e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous links suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=skipping+rope+workout+app In PDF document text
    • https://static.s123-cdn-static.com/uploads/4459929/normal_5fceb90b1c5f8.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/cyprus_visa_application_form_qatar.pdfIn PDF document text
    • https://cdn.sqhk.co/supopareso/haNijeD/nexasavomodozamagipa.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/enWnibp/22332932926.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/wfSZhgA/7373190310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459921/normal_5febc2ca21936.pdfIn PDF document text
    • http://beremoter.online/kinobody_superhero_downloadt6i58.pdfIn PDF document text
    • http://easterthjg.com/191838414910988b.pdfIn PDF document text
    • https://cdn.sqhk.co/venifirub/Jocjgmu/warby_parker_eye_exam_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_600bf2502cf4a.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/qvidggH/how_to_get_likes_on_facebook_post_fast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5fc62cacb09b0.pdfIn PDF document text
    • http://fb-ig-violation.com/kununilrerq.pdfIn PDF document text
    • http://itwow.info/46431106796qif6s.pdfIn PDF document text
    • http://jevikewuk.iblogger.org/cisco_linksys_e1200_default_login.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_02cf46514f0f4124b2f3c6824c9aa38a.pdf?index=trueIn PDF document text
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_94f94fba140146e3901def702f4d05bc.pdf?index=trueIn PDF document text
    • http://lotawovuvowuk.rf.gd/algorithmen_und_datenstrukturen_in_c.pdfIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_d600cd27fad04ebcb3743d39d3c317ed.pdf?index=trueIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_7516af83388d405aa2f4b8aae828ac77.pdf?index=trueIn PDF document text
    • http://mujigakevomo.epizy.com/5th_grade_mental_math_worksheets.pdfIn PDF document text
    • http://musovinudebepak.epizy.com/difelilutuf.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_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 5036 bytes
SHA-256: 785d802d219ea4ba454ac33fe6a2956d30391ce9b5c202c19557900c7df5545b
font_01_sfnt_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 11072 bytes
SHA-256: 04b3701ea7b6d03afee5188e8f068f1b9bb1684f69cc5eb3c4734791f1e452b2

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