Malicious PDF — malware analysis report

Static analysis result for SHA-256 74360c99a0d160d8…

MALICIOUS

PDF

76.2 KB Created: 2021-02-16 08:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6a7e85817950765dd042ec2c485c3e4d SHA-1: 5fe8377ef134dc18473e61f0f487893bd9f7ca39 SHA-256: 74360c99a0d160d8de5245c1e63483c2c34a2b0772cf52c6c203ed5c0a625b5a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, including a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content.

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://crophysi.ru/strik?utm_term=the+story+of+arthur+truluv+trilogy In PDF document text
    • http://bilet-pdd.site/cnc_machine_tools_priceaydqn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368763/normal_5fed11dfad84e.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/jDiiGjc/ticker_tape_gorillaz.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/fcf6b5eb3df02e2.pdfIn PDF document text
    • http://kernig.store/acronis_backup_recovery_11._5_management_console4comk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5fd67be33e2d3.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/rivedo_gamubugon_vuzofude_jofefopowiwanub.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/3459972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446382/normal_60062f42789da.pdfIn PDF document text
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/gosekinidid.pdfIn PDF document text
    • http://afracheat3.xyz/lijawomejo415bx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_5fdc459b8a155.pdfIn PDF document text
    • http://albatros-trans.ru/que_es_el_contexto_linguisticoejtxb.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/sugowubuf/business_plan_template_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/kuzigejetunosiw.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_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 5140 bytes
SHA-256: 646c1361bc9349ce581313923acce10ef3e2bbd1d4032205be0249a70ddbef9d
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 11708 bytes
SHA-256: f8de45a6b6830c63a89e7e90b3b8be71ab34411de317db9f68075af43aee016e

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