Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d23a264f4953bc…

MALICIOUS

PDF

74.8 KB Created: 2021-02-20 04:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1a83cf59ef43256bae838a04a80bec80 SHA-1: f6467488557a3451af358622e4b3d3f0b7de79cc SHA-256: 54d23a264f4953bc86a4eb3628ceb5997d2b54ece5fbeb639a85699c6857d807
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The presence of numerous external URIs, many hosted on disposable domains and forming link farms, strongly suggests a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with exploitation for client execution, likely leading to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=super+smash+bros+pre+order+bonus PDF link annotation
    • http://makamar.online/dark_souls_trilogy_strategy_guide55v7q.pdfIn PDF document text
    • http://gratoramaa.space/jadwal_piala_dunia_2018_formatwhvpo.pdfIn PDF document text
    • http://crystal-light33.ru/36406268485veq77.pdfIn PDF document text
    • http://evakuator-uga.ru/pecoricco_formaggio_canestrato_primo_saleevv3h.pdfIn PDF document text
    • http://pet-guru.shop/gestion_financiere_d_une_pmeimk4p.pdfIn PDF document text
    • http://promoocaoameericanas.com/28398576749gw72.pdfIn PDF document text
    • http://save50it.info/android_21_good_deviantart9llt2.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/1mobile_market_apk_download_for_iphone9o931.pdfIn PDF document text
    • http://gratoraama.website/55880990655wt9ck.pdfIn PDF document text
    • http://tujofifebituxuv.22web.org/67376677897.pdfIn PDF document text
    • http://9gusevshop.website/lapobawujukutopu8ii6k.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/egdgcsC/animal_color_by_number_coloring_book_app.pdfIn PDF document text
    • http://xokesate.22web.org/ridupavorebujix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zibarubo.epizy.com/psc_marksheet_2018_sylhet_board.pdfIn PDF document text
    • http://jatixafaduv.rf.gd/tibaji.pdfIn PDF document text
    • http://porasagusoxi.rf.gd/62733748212.pdfIn PDF document text
    • http://zowonotetejubi.rf.gd/mumeduke.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 5164 bytes
SHA-256: d4e2208933a1a42a062b9f6cd718f692ae89a586c0f6beffebc7bf2cca87af09
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 11160 bytes
SHA-256: d81dcc16f2a0629e42aca23119965948f70ee895186d46ae2a49bb0fc06d7c6e
font_02_sfnt_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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