Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca5af9c18c115ca…

MALICIOUS

PDF

123.2 KB Created: 2021-03-24 19:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 412addd76ece12ec30f81827ddb664b8 SHA-1: c4e3f388943ce11295f9c55fac9cf5a5f107fe0d SHA-256: bca5af9c18c115ca19ef094ed28934ac73cf56705b0b2527b3929134b76a4dd6
192 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains elements suggesting a lure related to 'Aha arrhythmia guidelines pdf'. The presence of numerous embedded URLs, many pointing to disposable hosting, further supports a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/award?keyword=aha+arrhythmia+guidelines+pdf In PDF document text
    • http://genusadnlo.space/xegamapejobelhct6.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/blJhbhj/best_drought_proof_plants.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/mugemitedate.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/creative_writing_internships_summer_2021.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/mary_balogh_chomikuj.pdfIn PDF document text
    • http://lifelalulenomip.mygamesonline.org/mesepix.pdfIn PDF document text
    • http://apeech.ru/hp_probook_4540s_i3_release_dategu0sr.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/92992104248.pdfIn PDF document text
    • http://redirunna.xyz/resavijilikogizim5veyg.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/how_to_get_my_maryland_driving_record.pdfIn PDF document text
    • https://cdn.sqhk.co/fofubulami/girKij4/teacher_appreciation_week_gift_ideas_daycare.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/estratgia_empresarial_livro.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/tetiri.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/hvbgcif/vokeberozejirim.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/11574714511.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/cC7jfic/86623135450.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/SThojgG/62192863014.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/fanijudaxarudamosujojew.pdfIn PDF document text
    • http://torchqbfl.fun/how_to_become_a_specialist_physician41cwh.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/limilonakotigowalarune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/the_inaugural_blood_bowl_almanac_vk.pdfIn PDF document text
    • http://jemileti.atwebpages.com/gaxutufadones.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/47186832778.pdfIn PDF document text
    • http://kewetanetoza.atwebpages.com/binomials_in_english.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/metomufosamoxan.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A636 5544 bytes
SHA-256: 1c8ffe2a5975760d1497f40a32359797f1fcfc5c1ad10474265d20cef0ab64d7
font_01_sfnt_off0001b8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8F4 11104 bytes
SHA-256: 802b69d3dab950c25977db0f3384f550bd6dcc0ce96e0e6d1259801ce00dd548

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