Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e87203a49cd2a81…

MALICIOUS

PDF

94.9 KB Created: 2021-03-28 18:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ccaa75bd0b96562641d7224d36edcad6 SHA-1: ed9df43574c8500b53ee133d1ce755f2428e976a SHA-256: 4e87203a49cd2a8116f280100f662e2790c9cb964eda232512958c9cfb8a4ee7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a network of links on low-reputation hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/award?keyword=abraham+maslow+pyramid+of+needs+pdf PDF link annotation
    • http://leporabev.mywebcommunity.org/schema_analisi_periodo.pdfIn PDF document text
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/munusasagagi_bedevir_zadewima_sazatovam.pdfIn PDF document text
    • https://sulasaboxa.weebly.com/uploads/1/3/4/7/134767053/vemabawalurawuti.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/3960438.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/NhjMjad/konexoxulomi.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/99986608431.pdfIn PDF document text
    • https://misirukizos.weebly.com/uploads/1/3/4/0/134017349/d2bc6447c11e69c.pdfIn PDF document text
    • https://nurosamemozixa.weebly.com/uploads/1/3/4/3/134375837/170036.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/all_souls_trilogy.pdfIn PDF document text
    • https://wuzituvivewug.weebly.com/uploads/1/3/5/3/135306668/bibimamikomunet-karelosel-kimilulowu.pdfIn PDF document text
    • https://mowejeli.weebly.com/uploads/1/3/4/6/134672800/lejaluwevogafowutilo.pdfIn PDF document text
    • https://lowunipuso.weebly.com/uploads/1/3/1/4/131453219/5893740.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/techos_verdes.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/eb47aba0-ae3d-4cbf-a80a-4f856b6017cc/lejalutuvajirufesevinaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3573c395-f46a-4070-ac24-02618fd96bea/66460728932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee222320-0b6c-4f51-8dff-52f1eaa8fe79/peg_perego_primo_viaggio_4-35_assembly.pdfIn PDF document text
    • http://miborebosat.rf.gd/icecream_apps_split_and_merge.pdfIn PDF document text
    • http://tuwesexo.epizy.com/colliers_indonesia_report.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_off00013284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 5604 bytes
SHA-256: f091c452bc510b8a4d9e33b9c36b0ad7d261837621745c9465351a538fe1ef8c
font_01_sfnt_off00014577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14577 11540 bytes
SHA-256: f4fa17999b105795d153064966c8a8697d55050285c8f804528f807b24262ed0

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