Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efc273aaedd0944…

MALICIOUS

PDF

68.8 KB Created: 2021-01-26 13:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bb74209003dbecb1cfd085d8cb5f2d6b SHA-1: 7a8f6aec1bb1fc0f0a06f72163b6b9bbf4492de0 SHA-256: 8efc273aaedd094491e9204d6a4a18d5cc3af661215370710b26a888e73734d0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that redirect to known malicious infrastructure and disposable hosting sites, indicating a phishing or malware distribution attempt. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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://traffmen.ru/aws?utm_term=animation+books+free In PDF document text
    • http://prizinsta24.site/vanomagadewexademaeo5.pdfIn PDF document text
    • http://tersq.fun/mod_minecraft_sans_virus3dsya.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/toggle_off_traduzioneg4g75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_600e5a092380c.pdfIn PDF document text
    • http://fuwenosod.iblogger.org/17689344843.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/eih3Whf/247_blinds_discount_code_december_2019.pdfIn PDF document text
    • http://blaugrana.ru/23595917864b96k4.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/ijbwjdG/92002887720.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/NVjahbl/detention_melanie_martinez_lyrics_clean.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446643/normal_60002f943657d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_5fd7d7b08674e.pdfIn PDF document text
    • https://cdn.sqhk.co/govulasem/Rjf9gcU/best_ringtones_dp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_600820a5c2307.pdfIn PDF document text
    • http://price-list.moscow/69188150363yeiph.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixopesibesuges.epizy.com/housefull_4_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/rbi_draft_guidelines_on_liquidity_coverage_ratio.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/english_words_with_meaning_in_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/bootstrap_file_upload_example.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_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 5072 bytes
SHA-256: 0c762d1334685dd7a523bee9d1b2c86a431f793413bce30aa97320151b770d26
font_01_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 9784 bytes
SHA-256: 88f2e449a7a1a0dca3ec9dde74f1aae7810d944c8794587c2bc2173f8dcd7de1

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