Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4eaf1bdeb2de86…

MALICIOUS

PDF

104.3 KB Created: 2021-02-25 07:24:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 46c50f94a2c07301cc011d077910e1c9 SHA-1: 2056551df416fe66d1054365ee4e11358a31d50f SHA-256: 4e4eaf1bdeb2de86e2c013508c9968769269a6302d483f823c0dec5ab1da4c46
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The document body contains a search query "can you make a flamethrower", suggesting a phishing or scam lure. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=can+you+make+a+flamethrower PDF link annotation
    • https://ribigitapupag.weebly.com/uploads/1/3/4/8/134887221/xipodab.pdfIn PDF document text
    • https://giboritozi.weebly.com/uploads/1/3/1/3/131379296/rejazowoguv.pdfIn PDF document text
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/5803701.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/fovetosexuza.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/cjernY2/78436679126.pdfIn PDF document text
    • https://fenatafu.weebly.com/uploads/1/3/1/6/131637570/jiguwo_simawemakona.pdfIn PDF document text
    • https://kasivolonu.weebly.com/uploads/1/3/4/6/134688646/d046b53f3560.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/f348e111db15.pdfIn PDF document text
    • http://rankingcoach-seo.com/9square_for_instagram_apkswcmx.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/sepigokuwadiraf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/rinnai_infinity_20_installation_price.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/22710907526.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/cubic_sequences_worksheet.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_off0001489c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489C 5224 bytes
SHA-256: 05113d5d5893b0a89d9ba10788bc612313b0ff3ba0f07f1c0d8d40128edad06f
font_01_sfnt_off00015ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD3 4992 bytes
SHA-256: a755da139e93360b554853bf54b237409eade85dd5e028920d2ea724a2bc08ea
font_02_sfnt_off00016bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBB 12332 bytes
SHA-256: 361947894d5a074db320f4be4a345fd2ada38545154842b683e2cf1b2d20a5a4

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