Malicious PDF — malware analysis report

Static analysis result for SHA-256 c880bdf35d4bddd0…

MALICIOUS

PDF

75.6 KB Created: 2021-04-04 08:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0d6ade4c423e7f5e334af223c730fb73 SHA-1: cf687500daa858c4b5c4cb8af5a23c4de01d1d62 SHA-256: c880bdf35d4bddd05bb5b6764a8b2e3441cff1bdf389610d3be42aec561b8d51
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. 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 suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dafemum.ru/strik?utm_term=build+your+own+big+green+egg+table In PDF document text
    • http://wutoxurusot.iblogger.org/verizon_fios_customer_service_maryland_phone_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_602c27233cf11.pdfIn PDF document text
    • http://lalikexitaxixix.getenjoyment.net/88312284941.pdfIn PDF document text
    • http://gemigowijudas.iblogger.org/watermelon_farming_in_nigeria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_605b94db6256f.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/job_interview_question_whats_your_biggest_weakness.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/phonics_coloring_pages.pdfIn PDF document text
    • http://lenilafifita.22web.org/bugeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_600e6d925b665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_600c5a33856ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_6034501123d19.pdfIn PDF document text
    • http://kelirajisob.66ghz.com/35277444953.pdfIn PDF document text
    • http://tekelijod.iblogger.org/94408414574.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/diagnosis_asma_pada_anak.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/lepefi/jill_ann_weatherwax.pdfIn PDF document text
    • http://zobagef.epizy.com/troy_bilt_lawn_mower_blades_21_inch.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/tomojemivuwatelulidatove.pdfIn PDF document text
    • http://sozofini.epizy.com/how_long_does_it_take_the_anti_inflammatory_diet_to_work.pdfIn PDF document text
    • http://viposesarob.rf.gd/14612740084.pdfIn PDF document text
    • http://pizomapivume.epizy.com/why_you_always_in_the_mood_song_lyrics.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/geometry_polygons_worksheet_answer_key.pdfIn PDF document text
    • http://sokurunofizune.rf.gd/kigelilasagaxoririjona.pdfIn PDF document text
    • http://tekaxipi.epizy.com/peguguxaruwigorixorogeme.pdfIn PDF document text
    • http://sawurawefivovo.myartsonline.com/pesup.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/33519049348.pdfIn PDF document text
    • http://muzubosumewuxem.epizy.com/94097771617.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/dark_souls_3_npc_guide_v2.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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5200 bytes
SHA-256: 1985388d6504236c821b1d6f95443da4da1afeb40d81e783945d0f11551f6c13
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 10692 bytes
SHA-256: 5eb14f56ee37a63ce43ec131e2a2173b20bb5501b2ed367225c6b763cc208f66