Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36c02f20a8f6431…

MALICIOUS

PDF

91.3 KB Created: 2021-04-02 02:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6dc91af18bb67c4de2dab1ad3e74527a SHA-1: 5043d6357093710f28896001c65ec74f86fad6ca SHA-256: d36c02f20a8f64310a98de64c9342da43023d89882838feadc2178a2ae114f4b
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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/award?keyword=airbus+a380+flight+crew+operating+manual+pdf PDF link annotation
    • http://lagujegivupani.22web.org/bubbleupnp_full_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_6047c786ea247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_602d4d4b032c9.pdfIn PDF document text
    • http://megiloreb.mypressonline.com/autosar_tps_bsw_module_description_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483345/normal_604d2172bc396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_5fd6780862015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_605b9da3c0b2b.pdfIn PDF document text
    • http://oblakova.ru/vabolezibb67gv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_60438b5facdcb.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/pomagexezetafuf3fnc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fd62a13793ca.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/chemical_lab_report_example.pdfIn PDF document text
    • http://trudogoliya.online/skylight_david_hare_sparknoteskslx3.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/liraru.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/baby_trend_jogging_stroller_compatible_with_graco_click_connect.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368970/normal_5ffcf3aeaadd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_605bf19755fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501208/normal_600a11cac714b.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/rsmeans_building_construction_cost_data_2020.pdfIn PDF document text
    • http://maykistore.ru/simple_past_exercises_intermediate5kk12.pdfIn PDF document text
    • http://pubggaming.online/27761526844cwuvt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/muslim_baby_girl_names_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/nuziwe.pdfIn PDF document text
    • http://kagijido.myartsonline.com/doing_justice_preet_bharara.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/exercise_verb_to_be_worksheet.pdfIn PDF document text
    • http://sibexelopuni.epizy.com/bhojpuri_film_mp4_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/writing_decimals_to_thousandths_worksheets.pdfIn PDF document text
    • http://petifogowiga.epizy.com/mapa_antigua_guatemala.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/rufegurarasakewawiz.pdfIn PDF document text
    • http://nanoxamovafosox.epizy.com/14445231608.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_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 6292 bytes
SHA-256: f304cba082d2787eb37a6764651767c09660786398654812d72adc806de43b26
font_01_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 11812 bytes
SHA-256: d4ba0897afe039cc625a09e95006a7ec545c2320bf3c299348c5c8c1a5f9f031