Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcadc4a907285afd…

MALICIOUS

PDF

77.6 KB Created: 2021-05-29 21:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 84f6fe481e1e5aebaa9452e876006a5a SHA-1: 67b422d0a236831fe1cace86c61c0e0698852031 SHA-256: dcadc4a907285afd6f7e2bdfa936e4ac6afc68333921d813b06c10d0aa8a3db4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to multiple external URLs, one of which is `resalured.ru`. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or scam attempt, likely using a lure related to chemistry to attract clicks. The presence of numerous links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=que+caracteristicas+tienen+los+grupos+o+familias+de+la+tabla+periodica PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473052/normal_605ca28668bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_60538590cbfb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5ffc231815b5a.pdfIn PDF document text
    • https://gukusabijimesop.weebly.com/uploads/1/3/4/7/134761354/rapupogimugipibojab.pdfIn PDF document text
    • https://sikevitexin.weebly.com/uploads/1/3/5/3/135301450/kawupa-ravanugaz.pdfIn PDF document text
    • https://leximefowa.weebly.com/uploads/1/3/2/6/132680903/1c73fac8fabe3a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_60275aa1e2b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_6050c45452813.pdfIn PDF document text
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/62e4577b88b95fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_60587548149b8.pdfIn PDF document text
    • https://bovuvodesibos.weebly.com/uploads/1/3/4/3/134377535/2178138.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460072/normal_5fde6868b9343.pdfIn PDF document text
    • https://funesovikigaje.weebly.com/uploads/1/3/0/7/130740183/kovuzovujipimi_riporewevavez_pekof_kajiwavuwidum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_6062ca78d6311.pdfIn PDF document text
    • https://gibinebixupiv.weebly.com/uploads/1/3/1/3/131379057/wojixiderenalom.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/didefulut-misifimiwawelu-kirapid-kejurekakafowe.pdfIn PDF document text
    • https://fanapakukole.weebly.com/uploads/1/3/4/7/134756501/7961312.pdfIn PDF document text
    • https://puvixote.weebly.com/uploads/1/3/5/4/135400279/2077c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407994/normal_5fed1f2b77be1.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/7543d92e-b153-4fec-9f03-7eb4e3fe9b96/10314076583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c664135-0170-4cc0-959d-da7788ce2aa7/48229725758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b710d8b0-1c4d-473a-9ae6-eb2332cdf23b/4887817372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ee8461-1ed6-4938-8c76-e9ef161d8787/sabezitemaxikenivol.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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 5676 bytes
SHA-256: 2b500ad618e28260a5c05076773cee2d2c90700c14394b2f4de65741fa003118
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 11212 bytes
SHA-256: c9a1c8c106dc365b83af579ab2900bc192630ce40b71559cce07c21d7683536e