Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abc578ab7e8dcbe…

MALICIOUS

PDF

75.4 KB Created: 2021-02-24 10:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: de9f2b0182e20ba3193b41c40689f006 SHA-1: 5cde82f66a95c4c7cab7e35f35fcd1480fc0314d SHA-256: 8abc578ab7e8dcbe35d0a54616946a148ffe72d7d8a5989c0b60cb8b607204b0
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL appears to be a lure for downloading Java, which could be a pretext for delivering malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://jacksth.ru/aws?utm_term=java+version+8+download+for+windows+10+32+bit PDF link annotation
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/narevis-ginazala-zuvogip.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/c78c222b3.pdfIn PDF document text
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/madosuwa.pdfIn PDF document text
    • https://memapuzubabevu.weebly.com/uploads/1/3/0/8/130813849/9641858.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/ieQgegh/60819608000.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/hhZRlhc/tinkle_tonic_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/d6Zhal1/digital_marketing_jobs_atlanta.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/c938hji/vavatexasaxagugopa.pdfIn PDF document text
    • https://sudesiresa.weebly.com/uploads/1/3/4/8/134881981/ce4cd9.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/fhaVpeO/xixosasivulupewida.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/7218145.pdfIn PDF document text
    • http://futegejetebe.22web.org/glassless_mirror_sheets.pdfIn PDF document text
    • https://jowavuzawevubab.weebly.com/uploads/1/3/2/3/132303017/lakeri.pdfIn PDF document text
    • https://sumadapovememer.weebly.com/uploads/1/3/4/4/134494733/moxugipota-xosik-volobaduni-nixumowezeluto.pdfIn PDF document text
    • https://patinijogu.weebly.com/uploads/1/3/4/8/134854147/4811844.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/wirarabobum.pdfIn PDF document text
    • https://ripumoravoramex.weebly.com/uploads/1/3/1/6/131606135/pesibobana-mepitu.pdfIn PDF document text
    • https://pojadobaga.weebly.com/uploads/1/3/4/8/134853930/suwagifatujat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://difufoj.rf.gd/89439136883.pdfIn PDF document text
    • http://feputuwi.epizy.com/unstoppable_confidence_nlp.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_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 5868 bytes
SHA-256: 49a07a1a62327d9c9a99ee9d81c4d66fb0a5af7aedac8ca655277f5c190d915c
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 10176 bytes
SHA-256: faf16c8f7950473f5c2031c9ecc5dcfcb06e9d1ff41fa4039f9bb56e2baa6aa7