Malicious PDF — malware analysis report

Static analysis result for SHA-256 55663212d85e6aed…

MALICIOUS

PDF

75.1 KB Created: 2021-05-24 11:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d570e6c07670dc3f0297a43d05a73bee SHA-1: 90ecf5752089270f2fba6e9554ff44dc9c71d958 SHA-256: 55663212d85e6aedd979274ea01824a0321cf6b158c1f522c974e2aa1c4977a6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=my+chemical+romance+cancer+mp3+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368736/normal_5fede9ef3c5b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fd610cbc62c6.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/dfa7523.pdfIn PDF document text
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/403fa0e30d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_6057d2167b428.pdfIn PDF document text
    • https://zapowiwowo.weebly.com/uploads/1/3/0/7/130776131/vawimiv.pdfIn PDF document text
    • https://tiputanamadavok.weebly.com/uploads/1/3/5/3/135314880/486ea8ceedce436.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483589/normal_5fcd23ac9e143.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/7ab77a8f98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5ff219dfb46bc.pdfIn PDF document text
    • https://bamususifilozok.weebly.com/uploads/1/3/1/3/131383301/afd6782bf3744.pdfIn PDF document text
    • https://kupujusurigov.weebly.com/uploads/1/3/4/4/134471221/4087687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478703/normal_6041c1444ce5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_604882f305d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_604e631a1dcf2.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/45fb5693-bfe6-406a-9d72-95147d6151ac/niveles_normales_de_ferritina_en_covid.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/64528473526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a24549c-d08a-45bc-a9ab-247c0d8b3024/vunebaxibefu.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/50603873190.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/79959142454.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/jenatakexugugogojine.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AA 5496 bytes
SHA-256: 265a8b02bd50689db7b245b0b265dc4df7fad5cd34bb6ed3517fb714975856a7
font_01_sfnt_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 13156 bytes
SHA-256: 6cebf014b299d221dad42a4cd162c0a36dce281629e5db551176178c5de00841
font_02_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 18776 bytes
SHA-256: dabf0ccc451caf4864c9b22ca91318a92e8f625b469dd0561edf59b451c7a792