Malicious PDF — malware analysis report

Static analysis result for SHA-256 75075f9838389285…

MALICIOUS

PDF

71.2 KB Created: 2021-04-24 03:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a25c2cc0d928834626cd19e97292f3a5 SHA-1: 40b536a1b6580cda76b949bf113cb6dbb0d94f72 SHA-256: 75075f9838389285ee06ee8d371d187f911ff372c1dd17e7f0f11b15af6aad96
126 Risk Score

Malware Insights

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

The file is a PDF containing a link to a suspicious URL, identified by heuristics as a link farm on disposable hosting and flagged by ML classifiers and ClamAV as malicious. The embedded content, though obfuscated, suggests a lure related to a book title, aligning with phishing or malware distribution tactics. The presence of external URIs and the overall detection as a phishing trojan strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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/strik?utm_term=psychology+from+inquiry+to+understanding+3rd+canadian+edition+pdf+free PDF link annotation
    • http://zatoxuvisovapuf.sportsontheweb.net/landlocked_countries_in_the_world.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/kojemujadejorenowivaj.pdfIn PDF document text
    • http://wulodab.iblogger.org/novorekizuvisa.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/81172055423.pdfIn PDF document text
    • http://jodopafipunew.22web.org/kivonajelakakive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fd654e568c4a.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/little_house_in_the_big_woods_novel.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/en_que_consiste_la_propuesta_de_valor_del_modelo_canvas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447466/normal_604637a87afb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5fe82505524dc.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/andres_oppenheimer_crear_o_morir.pdfIn PDF document text
    • http://ruzoboxilotazex.22web.org/68314560145.pdfIn PDF document text
    • http://xadazobisisim.scienceontheweb.net/36994449153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d1f38f-6a04-4db5-a434-300853f2d04c/79343505405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1181e37-da67-4af3-a688-656b9d961597/rosemarys_baby_age_rating.pdfIn PDF document text
    • http://zotapem.rf.gd/amoeba_sisters_enzymes_video_recap_answer_key.pdfIn PDF document text
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_d1911546ce304825865d793ed3c66fd2.pdf?index=trueIn PDF document text
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_f7e67e325f6348fd8190c5d7c40051e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26767eeb-ee79-4f69-a3e8-d18efebd5536/77953867571.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_bfda2781026440f296602b86288a8d8c.pdf?index=trueIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_4be4752548924812917ab0f739af0945.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b0c0a5-b60a-4f9c-bc0a-920f75f31859/orpheus_and_eurydice_hades.pdfIn PDF document text
    • http://minivenema.atwebpages.com/10630222304.pdfIn PDF document text
    • http://deweget.rf.gd/zigirufukez.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_60e4f8f6598446f2a0384e04f08868af.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_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 5964 bytes
SHA-256: c134de2519b5c18e7526683ff87e29a91a7d49dbc032510a99e536267b80b56a
font_01_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 10916 bytes
SHA-256: c841e4895e37a66b9b53248bc062d9816f0785b20797332cb99d1690edb9e828